Hi everyone. I was wondering if I should really put this here or not, but it will probably save you money.
Firstly, here is a website whch has the average prices of petrol in regions.http://www.whatprice.co.uk/car/local-petrol-prices.html
Secondly, find the cheapest petrol in your region and post it here.
I found for the North-West:
Unleaded - 79.9p
Disel - 84.9p
Good luck with your searches...