只有Tier 4 的dependent才能在境内转， 其他不行。也许拒签是因为这个原因呢，也许HOME OFFICE 刚发现这个问题，觉得之前发cos已经错了，所以随便找个理由给你拒了呢。。。
- 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.
Eligibility
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: established staff) visa and you’re applying to change sponsor
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, or you’re on another kind of student visa - read ‘Switching from a Tier 4 visa’ below
Tier 5 (Temporary Worker - Creative and sporting) for a job as a professional footballer and you meet the Tier 2 (Sportsperson) requirements
Highly Skilled Migrant Programme
Innovator Scheme
Fresh Talent: Working in Scotland Scheme
International Graduates Scheme (or its predecessor, the Science and Engineering Graduate Scheme)
Business and Commercial work permit (except multiple entry work permits)
Sports and Entertainment work permit (except multiple entry work permits)
You can also switch to a Tier 2 (General) visa if you’re:
a dependent partner of someone with a Tier 4 visa
a Jewish agency employee
operational ground staff of an overseas-owned airline
a minister of religion, missionary or member of a religious order
an overseas qualified nurse or midwife
writing up a thesis
a postgraduate doctor or dentist
a representative of an overseas business
a representative of an overseas newspaper, news agency or broadcasting organisation
a student union sabbatical officer
You must leave the UK and make your Tier 2 (General) application from abroad if you’re not in any of these categories.
