No minimum experience (although you must have done your first solo as some of the training is solo) and then it's basically about 5 hours - min. 3 dual including I think 1 hr night nav and 5 takeoffs and landings (full stops) solo. Full details are on the CAAs website under safety regulation. By the way I think CAP 53 is no longer valid. For the actual issue you must have a PPL to have the night qualification issued on, the night training can be part of the training for the PPL.
[ 17 November 2001: Message edited by: DB6 ]