I had not realised adventurous training had disappeared as well
It hasn't. It is simply more carefully scrutinised, after - guess what - cadet deaths on AT activity, which means that more effort is required well in advance to make it happen.
After 50 years of aviation and thus becoming well qualified, I decided to give a lot back to the cadet force. Firstly I offered my services to the local ATC Sqn but just got apathy. I then contacted another and got no reply.
Maybe the first unit had sufficient staff? And how do you know the second ever got your message? Sadly the websites listing contact details are rarely updated...always better to turn up in person.