The price estimates are quite good, just one or two things to add. You did not factor the ATPL exams into this which can be done for between £1500 and £4000 depending if you want to go full time or distance learning, plus 14x£60 for the exams themselves. Also there is no need to do the IMC rating and the multi can be done as part of the CPL saving you some money. There is the matter of hour building which depending on what you want to fly can be as cheap as £10per hour or over £100 per hour and you will need to build around 100 hours after the PPL.
Good luck with the lesson.