It does depend on the airline but for the orange on it was about 12.000 pounds. Do not, however, rely on this, as conditions and prices change every now and then and it could well be very different by the time you get there, if you are lucky to get there.
It would be very sensible to have some spare money apart from the training costs. Remedial training (they might include some, they always have, but not all of it), type ratings or others are things that you need to take into account.