If you download
LASORS 2006 you should find most answers.
Section C for PPL
Section F for Type Ratings
Section A5 for Medicals
Of particular interest will be these extracts from C2.2:
The holder of a current and valid PPL(H)* issued by an ICAO Contracting State (not being a JAA Member State), who has flown a minimum of 100 hours and meets the JAR-FCL PPL(H) flying experience requirements (including 5 hours instrument instruction) as pilot of helicopters, is credited the JAR-FCL PPL(H) training requirements, however they will be required to undertake the PPL(H) Skill Test on a helicopter type for which he is qualified. Applicants wishing to take the PPL(H) Skill Test on a helicopter type on which they are not qualified will be required to complete the training requirements for an additional helicopter type as detailed in Section F8.
The holder of a current and valid PPL(H)* issued by an ICAO Contracting State (not being a JAA Member State), who has flown less than 100 hours as pilot of helicopters, but meets the JAR-FCL PPL(H) flying experience requirements (including 5 hours instrument instruction) is credited the flying training, except the PPL(H) Skill Test. Applicants wishing to take the PPL(H) Skill Test on a helicopter type on which they are not qualified will be required to complete the training requirements for an additional helicopter type as detailed in Section F8.
Some H269 operators:
Stirling Helicopters, Norwich
Oxford
Bournemouth Helicopters
I recall there being a company in Ireland operating H269s too.
I think Fast Helicopters no longer have access to the H269 but I may be wrong
I would expect rates to be £250ish plus VAT depending on which variant.
I believe that it is only Class 1 Initials that must be conducted at Gatwick.
You may find
Standards Document 30, Registered Facilities and
Standards Document 31, FTOs useful for contact details.