I did mine with Oxford. Whilst the quality of notes and phone / email instruction was excellent, it was the 2-week brush up which set them aside IMO. Really great teachers who made it all fall into place.
Passed most of my 14 1st time as a result.
Have heard Bristol is good as well. There were several on the Oxford brush-up who had already been at Guildhall and Cabair for ATPL learning, which must say something.