I chatting to a CFI at Hayward (class D under the San Francisco Class B) area a few years back, and he said that he would not cut some US trained pilots lose in that airspace. Guys from places like Idaho might be very capable on 30 ft wide backcountry dirt strips, but just didn't have the RT skills to cope with Bay Approach.
Who says a newly minted PPL is going to be a hot-shot pilot on either side of the Atlantic. It's a licence to learn. All a PPL proves is that you are barely safe to let lose with passengers, IMO.
Isn't recent currency what really matters? So who do you think will have the most hours logged in the past 90 days? Somebody who pays £50 per hour with no extras like landing fees and good availability of planes, or somebody who pays £100 per hour with all those little extras.
Experienced instructors charging more is fine by me.