Go to BPP in Reading, one of the tutors there is unbelievably hot. Failed that exam twice because I couldn't pay attention to anything other than her role play where she kept saying "I like double entry".
It depends on what your aims are really, will you be doing it in spare time? Funding it yourself? Doing it via a firm? etc etc
If my memory is correct if you do an ATT then you can use some of that towards an ACCA I believe. What sort of tax are you looking to study?
If your aim is to use it to progress up the ladder than ATT will be enough to open up the opportunity and then you can put the effort in to impress from there.
If its self funded then do an ATT to start with, think its only a few hundred and can be done relatively quickly as well. It will open up the doors to where you need to get to.
PM me when you qualify and I might be able to help you out.