I'm really surprised this hasn't been posted loads of times already, but nothing showing in searches.
Farmfoods sell 2L milk for £1 each (they're normally about £1.50ish in Tesco etc), but buy 2 for £1.50 - that's roughly half of what you pay in the main supermarkets.
Also, 2 standard Hovis loaves of bread can be had for a quid as well while you're there.
Great to see decent half-price bargains on essentials. Farmfoods always have vouchers kicking about in the newspaper for £2.50 off £25 or £5 off £50 if you're planning on stocking up. Great shop, not just for jakeys!