Hi ahdm, like you I had CBT on the NHS & your right its time limited When I terminated (around 4 weeks ago) I felt my final session didn't go as well as it could have. So I wrote a letter to my T (I do think you should write to your T if you want to) explaining that I was finding the ending much more difficult then expected & a couple of weeks later he wrote me back & asked me to come and see him for another session.

The only thing is, I was quite worried about not receiving a reply & if I would be able to deal with a rejection so I kept my letter relatively formal. So I'd say write a letter if you want, but think about the worst case scenario & how that would make you feel & if your ok with that go for it. Good Luck