Unleaded will fall by 2p to 111.9p per litre, and diesel will drop 4p to 124.9p. The prices will apply nationally at all the store's 171 forecourts across the UK from Thursday.
This site has the prices for your area http://www.petrolprices.com
(Thanks to Anti5580 for the link).
If you use an Asda Credit Card to pay for the petrol you will also get another 2p of per litre (thanks to dink for the info)
Morrisons as of now ( I believe their doing it now to all their petrol stations ) are dropping Unleaded by 2p and Diesel by 4p. Not to get out done by rivals Asda, Morrisons are dropping their petrol prices so fill up now or wait until other players drop their prices