Does anyone know where I could find a flat drive belt, the type that
is joined in situ with a scarf joint and an adhesive?

There used to be a company near Stirling Corner on the A1 near Barnet,
but I can't find their name now and assume they're not trading. The
belts were made by Walker Belting, who I also can't find.

I've had to move my lathe and the old belt had to be cut because it
passes through slots in the lathe bad. Any pointers would be
appreciated.