Excellent, more pilots in Sheffield.
I think you can do the ATPL GS before finishing the PPL in that it takes a while to wade through the stuff and if you are going fast/ full time you will have the PPL (A) done before getting to the first set of exams.
Checkout OAT and GTS for the GTS as well. GTS are marginally lower cost and more like having a personal tutor than the bigger schools (the biggest class I ever sat in was 6, the smallest (H only!) was 2 so you get to address what you want to go through). The OAT notes are very good (your welcome to borrow the ones I have and are done with seeing as your local). The GTS notes have a lot of content (my ones are all written on now so not so easy for somebody esle to use).
I think also HSBC are still providing loans in some form (more local discretion of the manager? - but check). HSBC in Woodseats are now very 'aviation aware' so may be somewhere where discretion may be in your favour.
h-r