Well I haven't even started training yet haha! I just needed to find out before I took the next step!
My experience at City was great! I think it really might be worth your while to go - I took breaks after every 2-3 clips and the screen they used was a new flatscreen monitor (I can't say whether that made any difference...but I passed at City with a difference of 1.75 between the score i got at CAA...) aswell as this, you use a chinrest to hold your head steady (once again, not sure if this made any difference). Another good thing is if you don't pass at City you don't have to tell the CAA about your result and add to the pesky averaging technique! So all in all, I wish I had never gone to the CAA for my 1st test!