你上home office 的网站上看一下
http://www.ukba.homeoffice.gov.uk/studyingintheuk/adult-students/applying/biometrics-id-cards/#下面的是具体办法
If your biometric residence permit is lost or stolen, you must report the loss or theft to us as soon as possible by phoning 0300 123 2412 from the UK or (+44) 20 8527 3623 from abroad. If you are abroad when your permit is lost or stolen, you should phone us before you try to return to the UK.
You must then use application form ICFN (RC) to apply for another permit. If you fail to do this within three months of reporting the theft or loss, you may need to pay a financial penalty of up to £1,000, or we may shorten your permission to stay. You can download the application form and guidance from the right side of this page.