1978 MG B Roadster

26 Bids Winner - BBY
1:15 PM, 07 May 2025Vehicle sold
Sold for

£4,840

(inc. Buyer’s Premium)
Winner - BBY
consigner image

Paul's review

Paul Hegarty - Consignment Specialist Message Paul

“ One of our favourite cars to offer, it's as British as Bonhams and like us at Online, from Abingdon ”

Everyone loves an MGB, and rightly so. They’re easy to work on, a very affordable classic, and there is a huge selection of spares available. Should you get stuck, there are several clubs full of enthusiasts all willing to help out fellow MG owners.

Background

Any car that stays in production for 18 years must be doing something right. And yet, even after this marathon run, such was its popularity that the MGB simply refused to die. British Motor Heritage started selling brand new bodyshells eight years after the car was last built, and the vast array of parts for the model effectively meant it was now possible to build your own ‘new’ MGB or BGT. But we’re getting ahead of ourselves.

The MGB was effectively a modernised MGA. The handsome looks are built around a monocoque bodyshell, with the MGA’s separate chassis construction replaced by a stronger, lighter, more modern design.

However, the rest of the car was remarkably similar – why change a winning formula? The BMC B-Series engine had now grown to 1798cc but retained the twin SU carburettors of the earlier car, and now made, for 1962, a healthy 95bhp.

A four-speed manual gearbox with synchromesh on the top three gears was again carried over from the earlier car, as was the option of an overdrive unit operating on third and fourth, and its output fed a live axle supported on cart springs. That non-synchro first gear was replaced by an all-synchro box in 1967.

In 1974 the cars were fitted with black rubber bumpers in place of the old chrome items, and the ride height was raised slightly, both moves designed to keep the car in line with new American safety regulations.

From 1980 onwards BL killed the B and put all its sports car eggs in Triumph’s wedge-shaped TR7 basket, but sales were never a patch on the MG and the Triumph itself became history within a year.

Key Facts


  • Running and Driving Well
  • Retrimmed Interior
  • Rare Impact Bumper Car

  • GHN5-477678G
  • 53,535 Miles
  • 1798cc
  • manual
  • Inca Yellow
  • Black
  • Right-hand drive
  • Petrol

Vehicle location
Bonhams|Cars Online HQ, United Kingdom

Background

Any car that stays in production for 18 years must be doing something right. And yet, even after this marathon run, such was its popularity that the MGB simply refused to die. British Motor Heritage started selling brand new bodyshells eight years after the car was last built, and the vast array of parts for the model effectively meant it was now possible to build your own ‘new’ MGB or BGT. But we’re getting ahead of ourselves.

The MGB was effectively a modernised MGA. The handsome looks are built around a monocoque bodyshell, with the MGA’s separate chassis construction replaced by a stronger, lighter, more modern design.

However, the rest of the car was remarkably similar – why change a winning formula? The BMC B-Series engine had now grown to 1798cc but retained the twin SU carburettors of the earlier car, and now made, for 1962, a healthy 95bhp.

A four-speed manual gearbox with synchromesh on the top three gears was again carried over from the earlier car, as was the option of an overdrive unit operating on third and fourth, and its output fed a live axle supported on cart springs. That non-synchro first gear was replaced by an all-synchro box in 1967.

In 1974 the cars were fitted with black rubber bumpers in place of the old chrome items, and the ride height was raised slightly, both moves designed to keep the car in line with new American safety regulations.

From 1980 onwards BL killed the B and put all its sports car eggs in Triumph’s wedge-shaped TR7 basket, but sales were never a patch on the MG and the Triumph itself became history within a year.

Video

Overview

Registered on the 4th October 1978, this lovely, well-presented Inca Yellow MG B Roadster has been with the vendor for just a few months and a change in circumstances means it’s now up for grabs just in time for the summer.

The desirable low-mileage Inca Yellow MG has been restored several years ago by a former keeper to what would appear to be a high standard. The car has recently received a new roof along with a set of refurbished Rostyle wheels, whilst inside there has been some restoration with leather seats, and a new steering wheel and carpet set.

Exterior

As you probably know, after 1974 the bumpers used were rubber impact bumpers to meet US safety regulations. It's each to their own personal preference; some prefer the older style chrome bumpers and some prefer the later rubber style, either way it’s not a difficult task to fit whichever you prefer.

Let’s start at the front: the rubber bumper is in good condition with just a couple of small marks and a tiny bit of perishing just above the MG badge. The indicators are in good condition with no damage to the lenses, however there is some tarnishing to the reflectors in the headlights, but these would be an easy item to replace and are readily available. The bonnet aligns well with an equal gap along each edge and further up the windscreen frame is in good condition.

Around to the sides of the British classic, the door shut lines have an equal gap and the sides look to be free of any dings or dents. The windows appear in good condition with no noticeable scratches. The vinyl roof has recently been replaced, therefore the plastic windows are free from any clouding or discolouration.

At the rear, the light lenses are free from any splits or cracks, and the rubber bumper has a couple of light marks but generally is in good condition.

Running on a set of classic Rostyle wheels, these are finished in silver and black with a highly polished chrome trim fitted to the rim. The tyres are two different brands to the front and rear and there is a good amount of tread remaining on each.

Interior

Bringing a spot of luxury to the inside of the MG, the seats have been retrimmed in black leather and are in very good condition with just a tiny amount of colour wear to the driver’s bolster which could easily be recoloured. Both door cards are in good condition with no scuffs or damage noted.

The dashboard is in good order and all of the instruments present well, reported to work correctly apart from the rev counter, which has not been investigated. The odometer shows a reading of 53,531 miles. The switchgear presents well with no real signs of wear to the lettering and again is all said to be working as it should, and there has been a JVC CD head unit installed. A wood-rim three-spoke steering wheel is in excellent condition and the gear knob has the switch for the overdrive, which is working as you would expect.

Throughout the cabin, the carpets are in excellent condition with no signs of excessive wear because they have been replaced; this continues into the boot where there is a spare wheel, jack and wheel brace.

Mechanical

The 1.8-litre engine fires up without hesitation and comes to a smooth idle, with no issues reported by the vendor with regards to the running of the car. Fitted with a four-speed with overdrive gearbox, the change is smooth and the overdrive operates correctly via the gear knob mounted switch.

Stopping the MG are discs at the front and drums at the rear; these bring the car to a stop in a straight line with no juddering through the pedal or any issues reported.

Taking a look at the underside, this has been coated in stone guard to help prevent any unwanted corrosion. There are some areas of surface corrosion where some of the underseal has come off, and also on some of the suspension components.

History

Registered on the 4th October 1978, this MGB Roadster appears to have been well cared for over the years with a restoration by the previous keeper. Unfortunately, that is all we know about the car as the only paperwork to come with it is the V5C. However, with that said, you just have to look at the car to get an overall impression of it.

Covering just over 2,500 miles in the past ten years, there were regular MoTs carried out until 2021, which came back with no advisories on any test back until 2016, where the only thing mentioned was an exhaust blow.

Summary

Everyone loves an MGB, and rightly so. They’re easy to work on, a very affordable classic, and there is a huge selection of spares available. Should you get stuck, there are several clubs full of enthusiasts all willing to help out fellow MG owners.

Just in time for summer, two-seater, open-top motoring in a British classic – what could be better? We estimate for the pleasure this will bring you over the summer months, a guide price of between £5,000 - £8,000 is a bargain for a British classic.

Viewing is strongly encouraged, and this lot is located at Bonhams|Cars Online HQ. Viewings are STRICTLY BY APPOINTMENT and we are open weekdays between 10am - 12pm or 2pm - 4pm. To make a booking, please use the ‘Enquire About This Vehicle’ button on the listing. Feel free to ask any questions, or try our ‘Frequently Asked Questions’.

About this auction

Seller

Private: Martin747


Viewings Welcome

Viewing is strongly encouraged, and is strictly by appointment. To book one in the diary, please get in contact.

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