We organise weekly letter writing sessions every Sunday from 1pm at the Sumac Centre, 245 Gladstone St, Forest Fields, Nottingham, NG7 6HX.
A useful guide to writing to prisoners, written by Leeds ABC, can be found here: http://leedsabc.org/wp-content/uploads/2012/09/writing-to-prisoners-2012.pdf
Up to date prisoner lists are regularly posted on the Bristol ABC website: http://bristolabc.wordpress.com/