Hi Colin
Yes we have a pup tent, but it was more as an alternative for my son who is likely to be dropping in and out, rather than staying full time, as well as giving us a bit of extra room on longer trips when he is not around. Plus it could be handy on some sites where perhaps an additional tent on a pitch is less welcome.
The annexe would be useful, but is expensive for an occasional use addition to our set up, hence the search for the rare beasty
Ralph