Lets see ...
45hrs (Duel i.e. inc instructor fee) @ £130 / £140 = £5,850 / £6,300
10 Away landing fees @ around £12 = £120
7 PPL Exams @ £30each = £210
Examiner Fee (Radio Test) = £100
Class 2 medical = £160
PPL Books = £60
PPL Confuser = £30
Log Book = £10
Map = £15
Ruler = £5
Protractor = £5
CRP1/CRP5 = £45
Knee board = £15
Pens & Pencils = £3
Plane hire for 2.5hr test @ £110hr = £275
Examiner Fee (Skills Test) = £150
Licence issue (CAA) = £160
Then you might want to add in some cash for a coffees and bacon butties for you and your instructor on the away trips.
Cost of getting to and from your strip will vary, I make a 100mile round trip to my school.in a VW 1.9TDi at 55mpg.
So I guess £7,500 is a realistic figure for 45hrs but I think the average PPL student passes between 55hrs to 60hrs. I imagine there is nothing worse that flying 50hrs then giving up/delaying due to a lack of funds. So I'll agree with 'Shunter' £8k should see you through to gaining your PPL.
Good luck ... it's worth every penny