The government has commenced an Independent Review of Criminal Legal Aid - Ministry of Justice
Who qualifies for legal aid in criminal cases is set out by Ministry of Justice - HERE.
Cases in Magistrates' Courts are subject to both an Interests of Justice test AND a means test.
Cases in the Crown Court are subject to a means test. Even the individual who is acquitted may end up having to pay for defence costs. This "innocence tax" is particularly iniquitous.