I have already read lasors justiciar!
If you have read LASORS you have the answer! It is the one I gave a couple of days ago: 150 hours total required to
start the CPL
course and when, having passed to skills test you
apply for the licence you must by then have 200 hours or more
in total , of which at least 100 hours
must be P1. Of those 100 hours P1
at least 20 hours must be cross- country. The cross-country hours must
include a flight of 300 nm or more landing at two aerodromes apart from the aerodrome of departure.
You seem possibly to be confused over the difference between the CPL course, which consists of 25 hours flying, and the theoretical study leading to the exams. They are two distinct and separate stages and you need the exams
before you start on the CPL course. As you plan to do the IR you probably should do the full ATPL course for the ATPL exams. However, remember that your exams 'count' for the IR for only three years from the date you pass the last ATPL exam. If you think you will do the IR much further down the road than this then you can save time and money by simply doing the CPL course and exams. The CPL on its own is not actually worth too much as about all you will be able to do is to instruct and be paid. You cannot do any (hardly any) public transport work without an IR.
CPL courses are around £4,500 to £5,500 but add say 20% for contingencies. The CPL examiners fee is £600 + you must hire the aircraft for the test - say another £400. The ATPL course will cost about £1900 and you must budget for a total of 4 weeks class work provided by the course provider, so 4 weeks b & b! The exam fees to the CAA are currently £55 per exam paper, of which there are 14 at ATPL level. At least 2 nights staying around the test centre at Gatwick. Building the hours to at least 150 will be as cheep or expansive as you want them to be!