These were posted 2 months ago at this price. I tried to make those posts hot again but doesn't seem to be working. So posting this again as the promotion is back on at the petrol station. I'm assuming the same deal exists in-stores too.
Not sure when it started or how long its going to last, but stock up. For 90p you can't go wrong if you've got a carbed engine. Picked up 4 bottles to treat the motorbike.