You need to go to an examiner who will sign off a form which he will send to Gatwick. Some places may charge a tenner or so for the admin, but search about and you may get it free from someone who is not too busy and in a good mood, and does not want to rip you off!
And you need to get the signature before the expiry date, or you will need a full check of experience with an examiner, even if you have done the hours.
[ 28 October 2001: Message edited by: Lucifer ]