Thanks for your input everyone. Sadly I've not had the chance to get the bike out of the garage since I've returned home. I can't remember if I filled up with E10 before my ride Cornwall-Surrey but it was E10 coming home (not sure if this could have made a problem)
But will be filling up with E5 now I've found some and will take for a long ride and see if the problem is still there before looking deeper into it.
Thank you again for your help, I will report back
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