i found cybermidi.com to be gr8 value, you pay a one off fee for membership and you are entitled to unlimited downloads from their extensive catalogue, also they do a 'select' section which are midi's made from the top companies (hands on etc) you get a considerable discount for these but the catalogue ones which are of an amazing quality are very useable.

Where in the UK are ou craig - I'm from
sunny doncaster
:-)