Here's a later test on E5 fuels for our M5's in particular the 99RON ones and as you can see Texaco Supreme P+ is the one to go for which has no engine destroying ethanol, that's the one I'll be putting in my car in spite of the further trip to the station that stocks it.
V power I will avoid altogether with too much ethanol and detergents in it, Esso is a question mark with Momentum but Texaco has consistently come up with zero ethanol. Enjoy.