Hi!
Lots of options...The easiest one is probably to make a creamy pasta dish, like fettuccine alfredo or creamy garlic pasta.
It can be added to almost any soup to make it thick and creamy...potato and leek soup, mushroom soup, sweet potato soup...
You could make a dip with it as well! There are plenty of recipes available online that use double cream/heavy cream.
Butter chicken or other curries are also potential double cream uses.
Double cream can also be used for quiches or crustless quiches. Or even as marinade for meats/tofu.
It can be added to mashed potatoes, scrambled eggs or omelettes or puddings.
You can also make plenty of desserts with it...
Tiramisu, mousse, cheesecake, cookies, whipped cream topping for almost anything..
Or try blending it with chocolate/vanilla/coffee syrup/caramel/fruit/etc and freezing to get a tub of ice cream
Hope this helps!
Polina