£6000-£8000 is a lot for the ATPL exams especially if you also consider when studying full time you will not be earning any money, a possible loss of earnings of maybe about £6000, costing a total of around £13000!
I am personally doing mine distance learning with Bristol (who are very good) while working full time and am due to finish my last six soon which will have taken nine months. Total cost will be about £3500 which is about £10000 less for the same result. Its not for every one but worked for me!
Have also heard good things about Oxfords distance learning package.