What should I do if the British postgraduate plane fuse visa expires?

The main point you need to remember is that you need to send it by registered mail or express mail (express mail, which is safer) through UKBorderAgency within 4 weeks before the visa expires.

You need to make an appointment in advance. If you want to deal with it urgently, you need to apply to the immigration center of the Ministry of the Interior in Crydon four weeks before the visa expires.