favouristism and experienced ringers I go to other towers as a newish ringer and often they will ask what I am learning and want to practice. Is it worth emailing a few local ones and asking if they could help you with Cambridge Minor and before going you could always practice with an online simulator. Or find a local tower with a simulator so you can practice. There is all sorts of favouritism sadly. I’ve experienced it but luckily for me it doesn’t affect what I can learn which so far has been quite fair. Good luck!