Ds2 is anaphylactic to dairy so, even though I am vegetarian, I am dairy free too (mostly).
Try tofutti soya cheese, cream cheese and sour cream. You can make mushroom strogonoff with the sour cream, which is very nice. The soya cheddar substitute is good for pizza, cheese on toast or cheese sauce, but not for eating as is.
Try Oatly cream for anything you'd use single cream for.
Use coconut cream to make vegetable korma.
Use pureed mango with coconut cream and sugar to make homemade ice-cream (basic ice-cream maker required).
Tesco value margarine is dairy free and cheaper than Pure. Otherwise, try vitalite, which is also cheaper.
Homemade flapjack makes a good snack (for you) and google vegan cakes for some yummy, easy to make ideas.
There is very little I can't make dairy free these days, after 5 years of dairy free diet. This includes dairy free cheese cake and pancakes. Dairy free lasagne, pizza etc is easy. Also, if you are going out, watch the hidden dairy. We find fish and chips is the safest option for ds2 since dairy can even be found in stock cubes and ketchup!