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Accu might sort you out (not sure what their bulk prices are)
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I've used GWR fasteners before, usually through eBay. For small orders they send royal mail 24, haven't checked what they use for larger orders though.
Zinc plated, fully threaded (22p): https://www.gwr-fasteners.co.uk/m8-x-100mm-hexagon-setscrews-din-933---high-tensile-steel-88-zinc-plated-84729-p.asp
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Orbital Fasteners would be my choice too, and considerably cheaper (if you're in London and buy some extra stuff to get the free delivery).
https://www.orbitalfasteners.co.uk/products/m8-x-100-hexagon-head-set-screws-high-tensile-grade-8-8-bright-zinc-plated
I need to buy a few hundred 100mm long M8 bolts. Any suggestions where from that will deliver by the end of the week?
Screwfix have them, partially threaded about the last 20mm (according to reviews). This should be enough but only just, so I'd rather find some others that have a bit more thread. (Ideally comparable price ~23p each or less.)