Starting out (training) you could be looking at 18k - 20k a year mark but most wages are going to depend on what part of the country you're in. Once fully trained and with a decent amount of experience, it's not unreasonable to jump to the 50k - 60k mark. Some companies may insist on Chartered status for this, tho. Start your own practise and you can be earning as much as you're willing to work for.
Caveat:-
Figures are guesstimates only, your mileage may vary.