re: CAA ATPL Fees?
Current CPL and IR Test Fees payable to the CAA are £691!
This of course excludes the hire of the aeroplane for test.
CPL test can be approx 1hr30min, likewise 1hr45min for the IR. Depending on where you do the IR of course, as if you are not in Bristol, Leeds, Oxford or the other CAA exam airfield (Cranfield?) there will be a transit flight to the Airfield to meet the examiner from your FTO's base airfield. This will either be part of the IR you pay for or may be chargeable. Solo Hire of a Typical light twin (PA34, Be76, GA7)in the UK is around £250 per hour.
Hope this helps