Did my first batch of ATPLs at Guildhall (now London Metropolitan) I passed 6 out of 8. However was not entirely happy with the notes or the brush up course. I have heard that things have improved a lot recently.
Went to Bristol Groundschool for the second batch and they were able to offer help (feedback and their excellent CD) with the two resits. Passed 6 out of 6 and the two resits. Very happy with the notes and the brush up course at Bristol.
I agree that you should check out prospective training organisations thouroughly before you make a decision. Look through a sample of the notes to see if they suit you and ask about the support that's available. Be prepared for a lot of work and the odd set back. It'll be worth it in the end!
AP