Interesting topic. I'm a retired sixty-nine year old Yank, and also an avid 'detectorist', who periodically travels to England. Over the years, I've also solicited 'fellow treasure seekers' on several English web sites, in attempts to establish contacts for 'hunts'.
I also suggested mutual hospitality exchanges would be welcome, naively believing perhaps, that my Las Vegas residence would be an attraction of sorts? I never received a response...not one!
Now, I've come to believe that post war prosperity, generational differences, and international politics have perhaps created a growing Anglo-American antipathy.
Am I mistaken?