WWW,
A full-time LHR shorthaul pilot will do broadly the same number of hours as you indicate (the average is slightly more in fact) but with annual duty time approaching 2000 hours, usually spent hanging around in a windowless coffee bar in the bowels of T5 waiting for your next aircraft (fixed links are rare).
Personally, it's all the hanging around and feet dragging which gets to me.....
Edit: If you join today, you will get a five year shorthaul freeze. What this does not mean is that you can move to longhaul after five years. What it means is that you will have a valid bid which will be actioned subject to vacancies and your seniority. Currently, you will have to wait around seven years for your seniority to allow a move.