I found the answer to the cream (below)
Any comments on the rest would be welcome. I think I have way more questions than answers
In the US, cream is usually sold as:
Half-and-half (12% fat)
Whipping cream and whipped cream (30%)
Heavy cream, or heavy whipping cream (36%)
Manufacturer's cream (40%), mostly available from food-services supply wholesalers rather than groceries
Also common in the US is sour cream, which is cream that has been subjected to a bacterial culture that produces lactic acid, producing a sour taste, and that thickens the cream as well.
In the UK, cream is usually sold as:
Half cream (12%)
Single cream or Light cream (18%)
Whipping cream (35%)
Double cream (48%)
In the UK, clotted cream is a very high fat (55%) product processed with heat.