Justice site for legal professionals
http://www.justice.gov.uk/
Crown Prosecution Service
https://www.cps.gov.uk/
Legal Aid Agency
https://www.gov.uk/government/organisations/legal-aid-agency
Public Defender Service
https://publicdefenderservice.org.uk/
The Judiciary of England and Wales (incorporating the Judicial Studies Board)
www.judiciary.gov.uk
Home Office
www.homeoffice.gov.uk
Her Majesty's Court Service
https://www.gov.uk/government/organisations/hm-court-service
Law Society
http://www.lawsociety.org.uk/
Law Society Practice Notes:
www.lawsociety.org.uk/support-services/advice/practice-notes/
The list includes:
Criminal Procedure Rules 2015
https://www.justice.gov.uk/courts/procedure-rules/criminal
Virtual Courts
https://www.lawsociety.org.uk/support-services/advice/practice-notes/virtual-courts/
Defence Cost Orders
www.lawsociety.org.uk/support-services/advice/practice-notes/defence-costs-orders/
Defence witness notices
http://www.lawsociety.org.uk/support-services/advice/practice-notes/defence-witness-notice/
Withdrawing from a criminal case
www.lawsociety.org.uk/support-services/advice/practice-notes/withdrawing-from-a-criminal-case/
Solicitors Regulation Authority
www.sra.org.uk
Crime Line - low rate subscription web site - incredibly useful site, especially if you need to keep up to date on a regular basis
www.crimeline.info/legal-resources/
Criminal Cases Review Commission
www.ccrc.gov.uk
Guidance on the Police Station Accreditation Scheme
http://www.sra.org.uk/solicitors/accreditation/police-station-representatives-accreditation.page