How come there's such a huge difference in prices from one FTO to another ?
It's because there are no books included in that price. All of the material is online. You can purchase the books at an additional cost though.
It seems a good place with good pass rates. Also the structure is slightly different with it being broken into three stages followed by a one week revision course, instead of two stages followed by a two week revision course. To me, this is easier if you have to take time off work.