Came across the following document might be worth a read or a skim at least.
Just google DT1 pdf.
Covers all the stuff that the driving examiner is told. Chapter on LGV and Module 4.
What happens if accident on test for example.
A couple of tidbits:
I wasn’t aware that if you have provisional C and turn up a test centre to do a C1 test the examiners are instructed to proceed with test.
When you are asked to pull up on left (for a moving off test), try and pull up behind a vehicle. This way the examiner will accept it as both a moving start test and a moving off at an angle test.
I won’t spoil the rest. Intersting stuff in there. Might help to settle nerves a bit as well.