Odd One....indeed, reval cost flight time+75 quid for the examiner, but as hadn't flown with them before & was commercial school, needed another 2hr for a "pre-exam" flight. Kinda expensive....
The flight was also a full work-out, basically the GFT part of the Skills Test.
Brushing up regularly with an instructor is an excellent idea, but I think I will definitely try & avoid the whole exam experience again...