Similarly, lots of dark mutterings and dire warnings about ethanol in fuel on classic bike forums in the UK.

I haven't seen a definitive list which states one forecourt brand is ethanol-free. The only advice I've seen is to use super unleaded in preference to normal if you have any concerns: however, I've no idea if super is guaranteed ethanol-free either.

Actually, HJ has addressed this issue, here: www.honestjohn.co.uk/askhj/answer/37005/super-unle...l-

His answer says that super unleaded will typically contain max 5% ethanol (which most engines and fuel systems seem to be able to cope with), whereas normal unleaded can be up to 10% ethanol.

Having checked the BHVC register's website, they only list garages that still sell leaded fuel, there does not seem to be a definitive list of which modern fuels have ethanol.