THANK YOU ALL!
This is the closest I've ever been to "group therapy" and it works!
I note that not one person commended "sell"....
I will keep the car! (I knew I would!)

On reflection, as an ex-biker the M3W fills a void. My first M3W was a 2013 model which I kept for 4000 miles and 3 months before breakdowns got me down and I traded it in for a 2015 Plus 4. This I kept for 6 months in 2017 and put 7000 miles on it: but it wasn't for me: although much more reliable than my M3W, it didn't make me smile as much and driving it over speed humps - ever so slowly - always sounded as if you were ripping out the bottom of an ocean liner.

Whilst my real gripe is that a vehicle (M3W) that now costs £40k ono should be much more reliable, I realise eccentricity (or is it collective madness?) comes at a price.

Not many MDs of car companies respond to emails. To his credit, Steve Morris at MMC replied the same day when I fired off this moan to him. So whilst MMC and my dealer sort out a new petrol pump, I find myself missing my M3W as the sun shines on near-empty coastal roads here in Cornwall.

Once again, thanks everyone for your comments which have helped in this moment of weakness!