Hicks - Forget CAP53/54, they are no longer being amended and are no longer 'current' publications. The only up-to-date source of information is the latest CAA Policy Update vailable either on the website or, i think, by post on request.
The only organisations approved by the UK CAA for PPL/IR ground training are London Guildhall and PPSC. Neither are approved for distance learning courses. I'm not aware of any training providers in the Netherlands.