M&S do a nice champagne flavoured whipped cream but it's v. expensive. Regular aerosol stuff is alright, so long as it's unsweetened. Or you could buy whipping cream in a carton and whip it yourself.
what's the cream that people normally eat with strawberries? single? double? whipped??
Anything...whatever appeals to your taste, really. I'm personally not a great fan of whipped cream with strawberries. My favourite is strawberries with double cream and a few scoops of whatever icecream we've got in the freezer Pretty much a standard dessert in my house in hot weather