unless you only intend to land about 10 times in +/- 100 hours of hours building, i suggest you add some more money for landing fees. average is 10 pounds at most places. some places more.
CAA ATPL exam fees are 66 pounds per paper wich works out at 924.00 as long as you pass all of them first time.
CAA exam fees for the CPL is 762.00 and if im not mistaken, around the 400 mark for a partial. thats the same for the IR but you have to add aircraft hire and landing fees to that. when i did my IR skills test, it worked out to over a 2k day out and that was a first time pass. if you had to go back, you got to think of the cost of going there again and the extra sim/ flying before resitting as well.
the 170A for both, your CPL and IR will cost you dual hire plus 100pounds to the instructor.
what i did was work on 60k which included my travel, accomodation and food. if you spend less, its a bonus.