On very skint weeks, approaching pay day, I do my main shop there. I go round couting the meals as I put them in the trolley and adding up. Not great nutritionally but some of it is ok and I get staff discount at the greengrocers (DD1 works there), so that helps. I get a sack of spuds every couple of months.
I spend a tad over £25 to get home delivery, so save on taxi fair, just get the bus home.
I buy mince, sausages, chicken pieces, bread, milk, cheese. White fish pieces are nice and £2 for 5-enough for my family. SFC in a big box is more than enough for a Friday night treat.
Faggots are almost so cheap they pay me to eat them. 
Family size pies are yum.
I do realise it's not ideal nutrition wise, but better than starving. 
Me and DP love the chinese and indian meal mix ups that we buy there.