Suggestions - do most meals dairy free. Lots and lots of leafy green veg. More protein. Tomato based sauces for pasta. Avoid shop bought pesto!!!
No cheese sauces/milk sauces.
Do dinners you can adjust. Vitalite is a decent alternative for sandwiches.
BLOCK Stork can be used in baking and always produces excellent results - also good for mashing potatoes with. Must be the BLOCK Stork in the gold wrapper.
Tesco and Jus-Rol ready made pastry (obviously not the all butter ones, the basic ones) are dairy free. Except Tesco SWEET shortcrust. Their normal shortcrust is fine.
We have a lot of pies and pasties. Watch for dairy in gravy granules and stock cubes.
Casserole mixes in packets are all out - but Homepride sausage casserole JAR is dairy free.
Tagines are good, as you have ras-el-hanout to flavour the veg.
Oatly milk is ok on cereal, but I find Karo coconut milk has an odd 'grainy' texture.
Oatly cream, when whipped with an electric beater, makes a good substitute for dairy based cream.
You can make a lovely curry with a tin of tomatoes, vegetables, tikka curry powder and a drizzle of Oatly cream.
Is that enough suggestions?