If £60k is the maximum amount that you have available to spend then my advice is to check and double check your sums and make sure that you go through the price lists at OAT with a fine toothed comb. Check out their forums and get a feel for what it is costing other people who are already there. Also ask how many hours on average they are taking to get through to give you a rough estimate. Treat it just as you would when pricing up a CPL or IR at any other FTO. Add on extra training hours for both the CPL and IR to your budget to be on the safe side bearing in mind the feedback you get from current students. There are loads of threads here on pprune to check on what costs you are likely to be hit with and if they are included in the headline figures etc eg: landing fees, fuel surcharges, 170a fees, uniform charges, positioning costs for doing CAA tests etc. Don't forget accomodation and of course beer money as well!
Last thing you want is to get 90% of the way through the course and be worrying about being able to find the cash to finish.