Loud 'POP' and blue smoke

[mackat]

Bung!
I may have one lying around if you're in need

Back fire from a cylinder?

Will give you a whatsapp chap - think I still have your number

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So now youve worked out the cause of the over revving, you now need to work out why its back firing. If you have a friendly garage near by, i would suggest getting an emissions test then we should be able to see whats going on from there.

It's only just gone through its MOT, it did fail the first time with emissions, but by a very small percentage.

The mpg on the way up to Scotland was around 35.7 which is I think is good for a 6. Haven't worked out the mpg on the way back down yet.
But there is always a smell of fuel on startup until the engine warms up.