I can't wait for the search function to be operational - or the CAA and FAA website for that matter:
CAA form :
http://www.caa.co.uk/application.asp...=detail&id=521
FAA form :
http://www.faa.gov/licenses_certific...erify61-75.pdf
Send form to CAA and get charged 16 pounds.
Send form to FAA FSDO - look on FAA website
http://www.faa.gov and go and see an examiner who will normally charge $40 the privilege of issuing the FAA PPL based on your JAA PPL (is free at FSDO) Suggest you contact a flight school in the area your travelling to and ask.