Hi scrumpy
I took the test several months ago and it was a bit like being back at college doing some basic plumbing.
They don't expect you to know the regulations off by heart.
Technical questions were mainly simple ones consisting of health and safety. A few gas questions and some on septic tanks. If you don't do septic tanks as most British plumbers don't, then just google it as what I did and passed.
Practicals consisted of some waste from basin and wc into a stack, some threaded iron and some copper.
Don't panic, the instructors aren't there to fail you but to find out if your a chancer
Regards
Regan