Best timing belt and pulleys type for minimum backlash

[Clive S]

EDIT: Just a FYI, Bearing Station - Adhesives, Bearings, Belts, Chains, O Rings, Oil Seals, Pulleys & Sprockets are generally a bit cheaper and have a "price match guarantee", however they don't offer a machining service.

I have used them before a few times and to be fair they have been ok. BUT this last time they let me down badly with regards to delivery times in that I ordered 8 20t pulleys on the 5th August and despite 10 -12 phone calls which they promise to return with an answer, they never do. I have now got 7 of the 8 and they are telling me that none of their supplies have got any more and its not their fault. I now have rung Belting-on-line and they have plenty.
I personally will not be using them again. Clive