cpl £3,299 IR £11,800 ME £1,999 these are for min hours. As for accomadation a BB will be anything from £20+per night, I rented a small house with someone else and that cost £75 a week with kitchen etc.... Check out the BFC website they have houses to rent on there and B&B's. Count on it taking at least 12 weeks, probably more if you are to do the whole thing. Those costs dont include the test fees which are about £674 now i think for the CPl and IR not sure about the multi. In a nutshell you are not going to get much change from £20K.
Good luck
Dan