In the UK there is a professional association for Ts which they can join called the British Association for Counselling and Psychotherapy (bacp). It's not a requirement to join but it is generally recognised that it is better to find a T who is a member (I was advised to look for a bacp member when choosing a T).
My T is a member according to his website and I've never thought to question that, but I recently did a search of the register on the bacp website and neither he nor his wife (also a counsellor) were on there.
I emailed the bacp and asked if there was any reason a T wouldn't be listed and I received a reply saying that his registration could have lapsed, or it is possible, since the register is quite new, that he might be a member but not have signed the register (it does say 'registered' on his website).
The bacp said they can check his membership if I give them his name and area. I'm not sure whether I want to do that as I would feel like I'm sneaking around on him, but I'm not sure if I want to ask him because I don't want him to think I'm doubting him. He's been a good T to me and I don't doubt his professionalism. So should it even matter?
I don't think he would lie, and i am sure there is a simple explanation like the bacp email said, but the niggling doubt is bothering me a bit.