I own a Nokia 8890 phone with service based in San Diego.......don't ask.....

I'm flying to London Heathrow at the end of July to meet up with a ship sailing through Scandinavia to Russia and back to London.

I will have a relatively quick connection in London to get to Southampton and am flying Virgin Air.

Can someone point me to where I can purchase a prepaid SIM card at Heathrow that'll work in the Nokia phone so that I can be reachable by my office and place calls as needed?? I'll be sailing for 14 days.

I'd rather not incur the international roaming charges and per minute charges that Cingular has in place using their SIM card.

Thanks.