Min 5 hours 'foggles' no longer required for a uk ppl.
Most UK PPL(H) students take 70-100 hrs to get a PPL these days. UK PPL test standards seem a lot higher than years ago. This could be coming from the CAA/Examiners/Schools, or from schools looking to make more money, or both.
If you turned up at a UK flight school with an FAA PPL(H), I would budget another 10-20 hours to get a UK CAA PPL(H). You would need to pass a few ground exams (see links below), a practical radio test , a UK CAA class 2 medical, "training as required" (as deemed by the school) to reach CAA test standard, then the practical skills test.
Yes, I know 10-20 hours is a lot (considering you already have a PPL)... but you would need to re-do some manouvers (as they are taught slightly different in the UK), learn some new ones (eg downwind quickstops, OS map work, navigation at low height/poor visibility, advanced autos, radio navigation), learn how to Navigate and talk in busy UK airspace, doing some foggle flying (2 hours?), familiarise yourself with the local area/procedures, and a 2 hour skills test. That's at least 10 hours flying there.
FAA PPL to CAA PPL is not a "conversion" per se, it's just you are given allowances as you already hold an ICAO PPL.
https://www.caa.co.uk/general-aviati...r-helicopters/
https://www.caa.co.uk/general-aviati...-january-2023/