The Society of Authors: http://www.societyofauthors.org
The Royal Society of Literature: http://www.rslit.org
Citizens’ Advice Bureau: http://www.nacab.org.uk
Consumer Credit Counselling Service (a charity giving advice on debt): http://www.cccs.co.uk
Public Lending Right: http://www.plr.uk.com/
Gold Dust (a mentoring scheme for fiction writers):
http://www.gold-dust.org.uk