AndyG - you can log P1/S on successful flight tests and count it towards your 100 P1 for CPL issue, although I understand you can only include a maximum of 10 hours of P1/S time in your total. I used time logged on my PPL, IMC, CPL and IR flight tests as P1 towards my CPL issue.
Somebody told me that renewals count too (e.g. an IMC renewal).
Are you sure about gliding time? I though it was only 30 hours of self launching motor glider time (or touring motor glider, whatever that is) you could count? I might be wrong though.
Adding up all your test passes (including ME) should give you your 10 hours so you will need 22 additional P1 hours for your 100. BFC have a Cherokee 140 that you could rent while you're down there or you could hop over to the US for a couple of weeks and get it done for less.
All the best.
Hufty.