Been a member of Fed of Small Business for at least 12 years now,
They do a very good Newsletter, part of which keeps you updated with recent legislation type of things - what you may normally miss.
Free legal advice - needed this seriously couple of years ago (wonky worker). There wasa dedicated solicitor appointed to me that I could ring and ask for advice (whats the next step, can I do this or that etc).
Coop Bank are there main sponsors so free banking with them. I was a Coop banker before they became sponsors and was paying bank charges. Phoned Coop Bank up - gave them membership details and free banking set up.
Local area meeting (not into that) supposedly good for networking.
Many othe rthings too.
Cost me about £80 per year, but does depend on no of employees etc