You'll probably need a new pan.
Belling is now Morphy Richards., I believe. You can try here or possibly EBay
http://www.morphyrichards.co.uk/spares-and-accessories/breadmaker-spares-and-accessories/baking-pans/
From experience, I would suggest you invest in a new Panasonic breadmaker. After wearing out 3 budget brands, the Pana is very good.
XXX, May 2016