Arthur I'm not sure if your getting the right end of the stick by saying you want to join Donny AA and there match fising team (Diawa Doncaster).
Anyone can join Donny AA it costs about £17 and gives you access to there waters (
Fisheries ) but no matches!
Daiwa Dons is a team that fishes various leagues in South Yorks through the summer and Winter against other teams, you don't ask or pay to join you get asked by a rep from the team.
Are you wanting to join a team? Or a club that fishes matches in the donny area? The difference is in team matches you fish for points in your section of (however) many anglers in a club you fish to win individually.
You don't have to join Leeds AA to fish matches in the Leeds Area there are loads of decent clubs that fish matches every week. And if you want I can give you some info on who to talk to regarding joining which usually costs nothing and your more likely to find someone in your area who drives and is willing to give you a lift to matches.
Just trying to be helpful.