I have used Complex in the past for advice and consumables, the guy that owns it really knows his stuff and has always pointed me in the right direction.
Cant fault him (sorry dont know his name), father and son outfit I think.
They do mostly industrial cleaning chems and sundries, mostly Prochem, Jeyes and Clover etc etc but big in window cleaning stuff, brushes and consumables.
Good luck I say.
Murky