Couple of useful links for you
http://www.percychapman.co.uk
http://www.ccmoore.com
Both sell bulk ingredients and additives and there`s plenty of alturnatives to be found in most agricultural feed suppliers.
My local sells fishmeal(provomi66),pellets,dry dogfoods(both of these can be ground down),brewers yeast,kelp,garlic,molasses,cod liver oil,birdfoods and i`ll not even bother listing the particles they sell.
Also have a look in your local asian/chinese supermarkets and pay and weigh shops for herbs and spices,polenta,yellow semolina amongst many others.
If you gonna knock out baits in bulk then a move to compressed air baitguns www.pccox.co.uk and a small compressor is worth considering www.machinemart.co.uk www.aircompressorsonline.co.uk
Also look in your local Cash Convertor Pawn shop as our local is doing 8 bar 25/50litre models for £80 and £120 respectively.
And no it ain`t an oversized PVA stocking