Hi Sanguan.
I know it looks daunting but don't worry to much. It will probably take a couple of years or so if you don't go the intergrated route(£50,000 +). Look at the modular route, its a little cheaper (spread the costs).
As for you being 35. Yes you have to think seriously about it. Write to some of the airlines about their entry req. I dont mean just the large airlines. Try the regionals. They like to take on 'older' pilots, if you'll excuse the expression! Airlines look at older pilots as more experienced and more mature. You're not that old in terms of aviation anyway.
I have a friend who started training at 30, it took him 4 1/2 yrs. Modular. He is now flying for a subsidary of BA.
Make sure you look at the schools properly as well. The cheapest may not be so cheap as you thought. The most expensive, you maybe be paying for the name, as well as the training, which may payoff in the long run, it just depends on your finances.
One thing you must do, is start your training when you are sure you can afford to do it all. There is no point starting it and not being able to finish all the ratings you have to do.
Have you looked at being a flying instructor? Not the greatest pay in the world, but it builds your hours. My PPL instructor had only got his licence at 44. He got a job.
Good luck with whatever you choose.
Need any more info, ive just gone through the research, so just give me a shout. It would be no problem.
Good luck