Esso E5 is the higher octane fuel (98 RON IIRC), sadly not been ethanol free since last September or October. Tesco 99 is not recommended - caused Peter Jenks all sorts of problems with his Aero +8.

Graham (G4FUJ)

Sold L44FOR 4/4 Giallo Fly
'09 Gen2 MINI Cooper ragtop
'90 LR 90 SW