Well, I have come across various posts and threads not only here but many other forums as well asking for accessing the American Netflix in UK.
It is true that Netflix has been cracking down VPN services for quite long. But there are very few VPN services that provide us with servers which can help us to access American Netflix in UK.
I do use a Vyper VPN subscription for other purposes which I borrowed the account from my brother. But to access the American Netflix I use PureVPN as it does provide the desired servers for the access, and also at a cheaper rate.
Hope people having problems with the access of American Netflix in UK will have the issue sorted out.