Jellyman
I attended the test on Sept 30th, we were asked to take proof of your National Insurance Number, on official documentation (P60, NI card etc).
We had ours at the Britannia Flight Training Centre, where i imagine you'll have yours. From memory it's along Airport Way, then left into Percival Way and drive to the end. THe FTC is on the left at the end. Park behind the building. Entrance is at the back.
Best of luck.
high-flyer