Great pic Gary, I have an excellent pic of an MG TC too, just no way to post it on here.
Anyway, back to the original question, I've got to think that the reference to an MGB TC is just simply a typo and the guy means MG TC (as pictured by Gary), and I've seen lots of them. I browse classifieds a lot, for a hobby (kind of) and for my club newsletter, and I've seen too many weird typos to even begin listing them. I could probably start a column for all the typos I've seen in ads, and I think many are typed wrong by the publishers not the people submitting them.