Modular route can take anywhere from 18 months to 36 months or more. Time constraints apply once you have completed some sections. ATPLs must be completed within 18 months and once you have done your ATPLs, I think you have to pass your IR within 36 months - did I read that somewhere?
It'll cost from £35,000 to £50,000 inc everything depending on how well you plan and where you do your training.