Lizmay - some online shops can be delivered for as little as £1 round my way (south east - sainsbo) or do click and collect if charges too much.
Eggs. Eggs eggs eggs are KEY to weightloss. Don't worry about the "cholesterol" - eating high cholesterol food doesn't give you high cholesterol. Anyway, hard boil eggs and keep them in the fridge. These were amazing when I was losing weight. I still like to mush them up in a cup with a little bit of salted butter (really) and eat as a snack mid morning. Spanish Omelettes for dinner, scrambled for breakfast. I get through 3-4 eggs a day.
I'd absolutely recommend that you Read "pure white and deadly" - it's a book from the 70s about sugar and it changed the way I look at food.
Anyway, here's a standard day of food, as an example:
Breakfast: 2 scrambled eggs, 2 slices ham, 1 slice toast (Vogel bread)
Snack: 1 mushed up egg, celery sticks, low fat Philly
Lunch: handful of chicken pieces, 10 baby tomatoes, slices of cucumber ,1 babybel, 3 oatcakes max (Nairns cheese ones are great - VERY low sugar). humous.
Snack: 1 apple, sliced, with nut butter on slices (if you like it!)
Dinner: Tuna pasta bake, but ratio of Tuna:pasta is 1:1 (for you; the kids can have less tuna more pasta)
You'll want something sweet after dinner. I can only say resist the urge by drinking hot drinks. Vanilla rooibis tea is excellent (I like it with a splash of milk, OH is horrified).
The thing is you can eat most things but the proportions need to be right, and usually when one has put on a load, the portions & proportions have all gone to shit!
Godspeed!