The application fee for an ATO providing training for the PPL and LAPL is £1000. This will buy you 5.8 hours of an inspector's time, which is what the Authority estimates is the time taken to process a fully compliant application. If the application is not fully compliant and, therefore, takes more than 5.8 hours to process, the extra time will be charged at £172 per hour up to a maximum total of £10,000 in any year or part thereof.
Each further course (e.g. LAPL to PPL upgrade, inclusion of TMG, Night Rating, Aerobatic Rating, etc.) will be charged at £500 per course and subject to the same £172 per hour surcharge if it takes more than 2.9 hours to process.
Depending upon the courses for which approval is sought, I would have thought £4-5000 quite possible as a final fee.