It is expensive to do this diet, but I find that because I'm not eating bread, using less milk, I do find that i am balancing it a bit better, not totally cheaper though.
I make things like Quiche with cottage cheese and eggs, they are handy to take to work and eat hot or cold. You could also make meatballs or patties with mince and prepare a yogurt dip. I buy my mince from Aldi, £2.49 for 800g and I split it in four batches.
With one batch, mix it with small bit of onion, herbs, a beaten egg and shape into small patties or meatballs and fry. I quite often add some chilli flakes as well.
Meatloaf with a boiled egg sliced in the middle like layers, this can probably be split into two days.
Scotch Eggs.
Turkey Sausages with a piece of Dukan Bread.
Cottage Cheese with Smoked Salmon mixed in is very tasty.
Smoked Salmon Omelette, can be reheated or eated cold.
PV Days you could take a salad with tuna or egg or cottage cheese.
I always have a portion of LS Jelly with my lunch.
If I think of anything else I add later. These are just a few, I've had, off the top of my head.