Ended up buying one of those buckets (not sure what else you'd call it) of hot and spicy chicken thighs from Marks and Spencer (UK). No idea how good they are for me; I've posted the nutritional content below - seems okay, though 30% of the fat is saturated, dunno how bad ~33g saturated fat is.
Other than that I just drank shakes, ate more nuts, protein bars, and an apple. I need to find stuff that fills me up, which hasn't got loads of carbs.
Boiled eggs are a good idea, I'll probably take some in on Friday. Not sure if I'm at the stage where I want to take a cooler full of steaks into work though, lol. How are they cold anyway?