I couldn't tell you how much it costs tbh smile at my local BP.. just glad I have a local source of E5..

I have taken Tim's advice though and ordered up a bottle of Castrol Valvemaster to keep in the Plus 8 though thumbs for when I go foreign and get caught short..

2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev