I am currently on Mod 2 with Bristol Groundschool, which I would personally recommend. Bristol have one of the best reputations around and you do 2 mods. Mod 1 is 8 exams as follows:
Met
Flight Planning
IFR Comms
VFR Comms
Mass & Balance
General Nav
Human Performance & Limitations
Instruments
Mod 2 then deals with the last 6:
Air Law
Aircraft Gen Knowledge
Principals of Flight
Performance
Radio Nav
Ops procedures
You do it as a modular course at your own pace, and then when you finish the manuals or the computer version, you do 2 weeks at Bristol GS itself down in Cheddar and normally, the exams the following week, although you can do them later if you wish.
Bristol is fantastic and definitely worth a look in.