I can tell you what not to do. Do not, under any circumstances, take the negatives to the printing place by the tube. I think it may be call Blackstock Print, or something like that, though it's actually by Wells Terrace.

I took in several rolls of b&w negs last year to get them scanned. It's around £4/roll. I actually have a negative scanner, but it's painfully slow, and I'm impatient. They promised to do it in 48 hours. In the end, it took over 2 weeks and they managed to scratch the negatives. Oh, and they still charged me full price for it.

Depending on how many rolls you want to scan, you can either take them to a decent (and more expensive) photo place like Snappy Snaps, or you could buy your very own scanner on Ebay. They're very reasonably priced because no one but me shoots on film anymore.

If you do go the Snappy Snaps route, shop around. They all charge a different amount. The Westminster one is almost 30% cheaper than the Soho ones. The Holloway one is a complete rip-off.