I would say not acceptable. Before an FI submits a student for test, they should make sure that all i's are dotted and t's are crossed so all the examiner should do is check and sign the application form, and check and sign the logbook. Then the student can (as long as the RT test has been done) chuck it all in an envelope and send it off, before having a well deserved cold beer. (and then spend 3 weeks getting angry at the CAA for relieving you of lots of money and then still taking lots of time to print several sheets of paper).
The CFI/examiner needs to make time to complete his/her paperwork, that is part of the job that you are paying (very good money) for them to do. I think a 2 week wait for them to even put a couple of signatures down and hand you back the paperwork is completely out of order!
Also £10,000 for a PPL, did you have any particular troubles/delays during your PPL? or are they simply ludicrously expensive?