Try
this until you manage to locate one that does sell E5, I'd be surprised if Exeter doesn't have a few sites as I can get it in Dartmouth BP site of all places at £1.499.
I carry a bottle in the Plus 8 just in case I have to put E10 in, the engine is ok but it's the pipes that are vulnerable on mine.
The major petrol companies run a site locator program which might help out.
The Castrol Valvemaster is NOT compatible with CATS !! so I shall be passing mine on to a friend with an old Landie.
