ALL the Skills available in The Republic of America, COULD be made available in the UK.
It just probably isn't financially feasible at this time.
Think how many Shops are in America against how many in UK, each would have to be willing to pay Amazon a few pence (dollars).
I don't see what the number of shops in the US vs the UK has anything to do with whether skills or features are available here. And what makes you think that this would require every shop to make a payment to Amazon?