http://www.bbc.co.uk/radio1/onemusic/industry/
Good full on guide for the British music industry

http://www.cops.co.uk/the-biz_page.html
COPS is a UK manufacturer (vinyl and cd). Plenty of useful and detailed biz information too.

http://www.insound.com
indie label's online store. check the mechanics section for essays and guides.

http://www.hertz-lion.com/yields.html
experimental, industrial resources

UK industry directories:

Listings of Venues, Distributors etc. for sale

The Unsigned Guide
http://www.theunsignedguide.com

Music Industry Manual
http://www.musicindustrymanual.net

Music Week Directory
http://www.subscription.co.uk/products/mwdir

Showcase International Music Book
http://www.showcase-music.com/order.htm