Need help this month - £46 for food for 2 adults, 3 pets and toddler

What sort of tinned/dry stuff do you have?

You could maybe make your soups- like the tomato & chicken into sauces & jazz them up a bit ,if they are yucky.
The same thing can be done with the chicken soup, either add it some pasta dish or to a casserole.
Or use them as a stock for a better soup, maybe adding some pulses.
You can also add the beans to sausages for a casserole, sprinkle some cheese on just before serving -easy to do & add some nice crusty bread as well.
Do you have any dried pasta or flour ?

First thought that comes to mind is get a couple of bags of oats. 58p for Smartprice from Asda. You can use these as breakfasts, and adding it to the mince beef will double it's capacity. I can make 1lb of mince stretch across 12 meals by adding oats and veg.
Get a big tub of margarine (around the £2 mark). Obviously useful as a spread, but by adding half marg to flour, rubbing it in and adding water, you have dumplings to add to your soups, making them more filling, cheaply.
Have you considered dried milk for yourself and your husband? Lidl do an excellent one. We only use it in drinks - you can't tell the difference. It's £1.49 for a tin, and that will probably last you the month, or thereabouts. You can also use it in cooking. That will save a little on the fresh whole milk if you could just purchase that for your son to use.
Potatoes - Smartprice potatoes are around 80p for 2.5 kilos. Versatile, cheap and filling.
Another cheap meal we like - we buy the smartprice pitta breads...23p for six I think they are?
I chop onions finely, fry them up in a little butter or oil, add beans and cheese and serve with a pitta bread.
The corned beef could be made into a corned beef hash, or cornish pasties if you can make pastry.
I would be tempted by an offer they have on at asda - three chickens for a tenner.
Each one could do a roast dinner, a sweet and sour, a curry and a soup made from stock. They wouldn't do huge servings, but that would about cover your meat intake for the week.
make yorkshires/dumplings to bulk it out a bit, and serve with veg.
Carrots are 80p for 2k from asda at the moment. Onions are less than a quid for 2k. Swede about 80p a kilo?
A bag or two of lentils would be a good investment. High in protein and filling.
Eggs - Asda do 30 cooks eggs for under £3. They would cover you for the month for a couple of meals a week.
Buy bread flour (48p for 1.5k), a pot of allinsons yeast and make your own bread.
Pasta - cheap and filling. You already have pasta bake in your stocks.
I would also buy a couple of blocks of lard, and flour. Pastry is filling, easy to make and cheap.