You do not need a night qualification before commencing a modular CPL or IR course but you do need to meet the requirements for one before you can have the CPL ISSUED!
If you already have your CPL and IR passed then you now need to do 5 hours night flying to include 3 hours dual and 2 hours solo. The solo hours need to include 5 full stop landings. You do not need any paperwork, just put the hours in your log book.
Before anyone tries to disagree, this is exactly what I did. Then sent the paperwork off to the CAA and 3 weeks later a little blue book arrived.