bulk chemical supplies (UK)

Was wondering where you can get bulk supplies of chemicals in the UK from. I've been ordering from silverprint and sigma aldritch for most things but I can't find anywhere to get large quantities of ammonium thiosulphate anywhere. Was planning on mixing up some T-3 archival fixer. Are there any cheaper chemical suppliers about? Cheers

There's a few suppliers around but ideally you need somewhere close to you. I used Stowlin for some bulk chemicals, others came straight from the manufacturer depending on the quantity I needed. I bought Borax direct from Consolidated Borax(20 Mule Team) 2 or 3 metric tonnes at a time.

Ian