employment,either paid or unpaid, is not permitted for visitors

That might be the main reason:

what you propose to do constitutes employment,either paid or unpaid. This is not permitted for visitors to the UK.

所有跟帖： 

• 没错！ -BeingWithU- ♀ (0 bytes) () 06/25/2011 postreply 03:50:55

• 回复：employment,either paid or unpaid, is not permitted for visito -iamsamk- ♂ (15 bytes) () 06/25/2011 postreply 05:39:49