I did my PPL with Cambridge Aero Club so I didn't pay any landing fees. All in all I would say I spent a little over £8000 including equipment, books and test fees etc. Not bad considering I flew in modern Cessna 172SP's with very good instructors and nice facilities.
I would agree with IO540 in that you should try to have lessons as frequently as possible. You'll finish much quicker that way and save yourself some cash as well. I passed in 50 hours but my training was spread over two years due to college, weather, part time work and a lack of cash. I did often have large breaks in my training, once I had almost five months between lessons.
If I could do it again I would have finished college first so I could concentrate solely on flying. That said, I don't regret starting and completing my PPL at all. In fact I'm pretty proud that I managed to study for my A-levels, earn money and pay for my training myself.
£5,500 does seem like good value so go for it and have fun!