From The Register:

The Home Office will not appeal last week’s High Court decision which found its attempt to backdate changes to immigration rules for highly-skilled individuals was illegal.

In November 2006 the UK began moving to a points based immigration system but the Home Office wanted to effectively backdate this - so anyone living and working here under a permit from the old system would have to reapply or leave the country. The government was taken to court by volunteer group the Highly Skilled Migrants Programme Forum.

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