I, and quite a few others had an awful time early on in my training with a certain school at Humberside. It's been noted on here many times by myself and others.
Can't agree more with the logbook and invoices. Make 100% sure from day one you know what you're paying for i.e. Any groundschool time or paperwork given to you...if you have any doubts about anything, seek advice from someone who's been through the system before paying anything...