Guidance on the Interests of Justice Test (pdf)
http://www.justice.gov.uk/downloads/legal-aid/eligibility/guidance-consideration-defence-representation-order-applications.pdf
Guidance on Means Testing
http://www.justice.gov.uk/legal-aid/assess-your-clients-eligibility/crime-eligibility/means-test
The Criminal Legal Aid Manual (pdf)
http://www.justice.gov.uk/downloads/legal-aid/eligibility/criminal-legal-aid-manual-Jan14.pdf
Criminal Defence Service Forms (including most up to date versions of CRM 14 and CCR 15)
http://www.justice.gov.uk/forms/legal-aid-agency/criminal-forms/applications
Online Calculator
https://www.gov.uk/guidance/criminal-legal-aid-means-testing
Legal Aid eForms
https://www.gov.uk/guidance/legal-aid-eforms
Information about the Legal Aid Agency
https://www.gov.uk/government/organisations/legal-aid-agency
Costs in Criminal Proceedings Practice Direction
https://www.judiciary.uk/wp-content/uploads/2016/04/pd-costs-in-crim-cases-2015-consolidated-with-amendment-no1.pdf