Ah - the two week PPL course.
I've seen one person manage it - and they were NOT happy with the school.....nor did they get the "dedicated aircraft/unrestricted access" that they were promised.
I've seen other people not manage it - and return to the UK without the licence.
Sorry to hear that you have been caught up in it. If that is the course you want (PPL in two weeks) - then you'll have to stick with OFT, nobody else would attempt to offer it.
With regard to your comment....
if I am refused entry once, then in future I have to declare it
...don't worry about having to admit it.........it will be stamped in big letters in your passport "REFUSED ENTRY" - they will know without your admission.
Again, truly sorry to hear that you have been caught up in it.