I think up to 4 senior player spots are available as we only had 39 senior players in 2019.
I think you can have 38 - 40 seniors + 6 - 4 cat a rookies (44 total before cat b rookies, which you can have up to 3 meaning lists max out at 47).
Got to meet the Ox at the races. He was part of a buck's party so wasn't in brilliant form.
He did say that Paul Prymke was the best CHB he played with. Not sure if that was true or just the beer talking?!