Unfortunatly Sean your question has huge variables so is very difficult to answer with any exact figure or hours. The differences come about depndent on where you train and the route you follow. There are many many exams and flight tests along the way some of them such as the instrument rating can cost several thousand pounds, so having to re take flight tests can add large sums to the total cost.
A starting figure would be VERY approximatly £35-£40,000 STG Modular and £65-£70000 Integrated. As I have said there are huge variables to the above figures. Also in this age you can also expect to have to pay for a type rating when you have your CPL IR (commonly called a FATPL) and that can add another £20,000 to the costs.
Good luck