.....Until May 17th, when the UK comes into line with Europe - Haven't got the paperwork to hand, but off the top of my head I think 21 becomes the minimum age for NEW Full licences, though current holders under 21 at that time will continue to operate on an exemption for 12 months, as will the rest of us, as licences will be re-issued over the course of the year with ULE renewals.
Possibly someone else has the precise details to hand - mine are all at work.
RC