I think the school has to be authorised though to enter students for the exams. Ground schools have to countersign the exam entry form.
Cheers
Whirls
Just goo-goo'd it - yes, Glasgow is authorised for ATPL(H) interim. For the difference in the fees and presuming you wouldn't have to pay for accommodation in Glasgow, I'd reckon full-time would be worth it. Use Bristol Ground school online question bank (which even Bristol students have to pay for) and you could have it done in 6 months.