Found some protein bars (plant-based?) on this site: healthfast.do.am/index/weight_management/0-10 (scroll to bottom of page) that work out at 62p per bar !! Or 62p for 14g of protein ! Purchased some last week and they are really nice tasting (chocolate peanut :P ) as well, I enjoyed it almost as much as I'd enjoy a regular choc bar !!
Hidden gem for cheap protein I say