The Civil Procedure Rules:
http://www.justice.gov.uk/courts/procedure-rules/civil
The Senior Court Costs Office:
http://www.justice.gov.uk/guidance/courts-and-tribunals/courts//senior-courts-co..
The Association of Costs Lawyers:
http://www.costslawyer.co.uk
The Costs Lawyer Standards Board – Setting and maintaining standards in the profession of the Costs Lawyer:
http://www.clsb.info
The Law Society:
http://www.lawsociety.org.uk