In reply to Pewtle:
I've used the high street chain Snappy Snaps several times. Results are decent, but you can expect dust and scratches.
I recently used AG Photo Lab's mail order service and was very impressed. I went for their "develop and scan" option — no prints — and the results were high quality, with excellent colour and no dust or scratches. Their prices are also very cheap, and turnaround time was one week. I'd recommend them.
An example of a scan from AG Photo Lab:
https://www.flickr.com/photos/51465885@N06/16035164345/