All decisions are made on a case by case basis under existing law and policy. The UK Border Agency’s website, as follows, provides details of policy and guidance that staff follow. This information is published as part of our commitment to freedom of information. Information on the number of cases found to be of those with criminal records in the UK and abroad (i-ii) and information on those refused ILR because of a criminal record in the UK and abroad (iii-iv) could be obtained by examination of individual case records only at disproportionate cost.
www.ukba.homeoffice.gov.uk/policyandlaw/