Simplest possible solution in my view is to use an additive. I've used Castrol Valvemaster Plus for years on my old engines, but it's not compatible with catalytic converters. There are cat-friendly additives available, such as Miller's EPS. Dead easy to carry a bottle with you and chuck some in every time you fill up. Only downside is that it adds £7 or so to the cost of a 50l tankful.
https://www.millersoils-shop.co.uk/eps-ethanol-protectionThank you Tim,
That looks interesting. It prompts two questions:
1) I wonder if it will stop the E10 fuel digesting the fuel filler pipe - the data sheet is a bit vague on that sort of issue?
2) I wonder how much the life of the fuel filler pipe on my car will be reduced by with E10 given that I don’t think these pipes last very long anyway?