JAR-FCL 1.125
(c) Night qualification. If the privileges of
the licence are to be exercised at night, at least
five additional hours flight time in aeroplanes
shall be completed at night comprising 3 hours
of dual instruction including at least 1 hour of
cross-country navigation and five solo take-offs
and five solo full-stop landings. This qualification
will be endorsed on the licence.
Once upon a time the UK CAA would issue IRs with a No Night Limitation but alas Europe has stopped that.