Originally Posted by
Boeing100
thank you, I figured it was odd I couldn't find mention of this anywhere on the CAA website.
It's probably a rule if you want to hire solo from the club where you trained, which you will find in the solo hirers section of the flying order book (which, as a student, you might not have been required to read and sign).
If you don't like it you can try to find another club that offers something you do like, or you can buy your own plane.