I was chauffeuring the old girl when I drove her Audi 100CD, also on the M4 so well designed that when in fifth gear you had to change down to 4th to change the cassette in the radio. Always some little niggardly thing going wrong.

On the other hand it was fast, when the old girl had been on a bender we thought she was about to snuff, being under orders she was to die in her own bed, I did Hans Place in London to her place Wiltshire in 50mins. That was late evening 40yrs ago. [To clarify said old girl was NOT my wife but an old titled lady who could have come from a PG Wodehose yarn]