How far along are you with your PPL? Have you met the minimum requirements of 25 dual/45 total already?
Doing your NQ as part of your PPL training has the advantage of counting towards the 25/45 hours PPL requirements as well as counting towards the NQ requirements. And if you have all the required night hours and solo take-offs and landings before you send the PPL exam paperwork to the CAA, it doesn't cost anything extra to get the NQ added to your license.
On the way to an ATPL you're going to need an NQ anyway, whether that's for CPL or IR is irrelevant. Might as well do it as part of a bigger program, so that it doesn't cost anything extra. And you might want to do it when it gets dark at five, so you have long hours of darkness before the airports close and your body wants to go to sleep. Although I would advise you to wait a month or so, when winter is properly here. Calmer and more importantly, more predictable weather.