So, finally decided to lay in some better quality belts, and did an order to these folk, for both Gates and Pix-X'tra items. All were 10mm extra-flexible Vee (Gates toothed on the outside, Pix on the inside):
http://www.bearingshopuk.co.uk/ - Kent Bearings
By-return delivery, and all fitted this morning. The machines have never run so smoothly. Result!

