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You are applying for a NEW entry clearance visa from abroad therefore a Restricted CoS is required.
Switch to this visa
You can apply to change (‘switch’) from another visa to a Tier 2 (General) visa.
You should apply before your current visa expires.
You must already be in the UK under any of the following visas or schemes:
Tier 1 visa
Tier 2 (Sportsperson) visa
Tier 2 (Minister of religion) visa
Tier 2 (Intra company Transfer) visa under the Immigration Rules in place before 6 April 2010 and you’re applying to change sponsor
Tier 4 visa - if you have an eligible qualification, will complete your course in 3 months, or you’ve done at least 12 months of a PhD
You can also switch to a Tier 2 (General) visa if you’re:
a dependent partner of someone with a Tier 4 visa
a representative of an overseas business