Thanks for the tips. Apparently we did have a circle cake pan hidden away so we used that. Before I was told about it, I had actually greased up the tin with butter and used baking paper rather than glad wrap. Unfortunately we realised that the base on the one we were making was too thick (I was following a rocky road cheesecake recipe) and even spread as thinly as possible it still took up 3 quarters of the (very shallow) cupcake tray

It's all good now though. I'll post a pic in today's dt