This isn't specific to US->UK but maybe it will help:
Substitutions for Cheeses, Creams and Milk
Blue Cheese also known as Bleu Cheese if imported: Roquefort or Gorgonzola
Brie: Camembert
Buttermilk: 1 cup milk plus 1 3/4 Tbsp cream of tarter. 1 cup sour cream.
Clotted Cream: Heavy cream, or sour cream plus a pinch of baking soda. Creme fraiche.
Cottage Cheese: Ricotta, yogurt (especially in dips), cream cheese.
Cream Cheese: Neufchatel or 1/2 cup low fat cottage cheese and 2 Tbsp butter, pureed.
Creme fraiche: Sour cream in recipes, sour cream and a pinch of baking soda add to "sweeten."
Edam: Gouda cheese.
Evaporated Milk: Light cream (half-and-half), heavy cream.
Farmer Cheese (White cheese): Cottage cheese, ricotta, cream cheese.
Gruyere: Swiss or Jalsberg cheeses.
Heavy Cream, 1 cup (not for whipping): 3/4 cup milk plus 1/3 cup butter; 3/4 cup milk plus
1/4 c shortening or butter; 2/3 cup evaporated milk.
Light Cream (half-and-half), 1 cup: 1/2 cup heavy cream plus 1/2 cup milk; 7/8 cup milk plus
3 Tbsp butter; 1/2 cup evaporated milk plus 1/2 cup milk.
Milk, 1 cup: 1/2 cup evaporated milk plus 1/2 cup water. In baking, 1 cup fruit juice instead.
Parmesan Cheese: Romano cheese.
Ricotta: Cottage cheese, liquid drained; cream cheese in small amounts.
Sour Cream, 1 cup: 2 Tbsp white vinegar plus enough milk to make 1 cup, let stand 5 minutes
before using; 1 tbsp lemon juice and enough evaporated milk to make 1 cup; 1 cup plain yogurt;
cottage cheese mixed with yogurt and if desired, 2 Tbsp milk and 1 Tbsp lemon juice, blend
well; 6 oz cream cheese and 3 Tbsp milk.
Sour milk: 1 1/2 Tbsp lemon juice or vinegar and enough milk to make 1 cup.
Swiss Cheese: Jalsberg which is lower in fat.
Whipping Cream, 1 cup, sweetened: 4 oz package frozen whipped cream topping; 1 cup nonfat
dry milk powder whipped with 1 cup ice water and sweetened to taste. For low calorie desserts
and drinks. It will not hold firm.
Yogurt: Sour cream; creme fraiche; buttermilk; heavy cream; mayonnaise (in small amounts,
especially in salads or dips.)