Colin, you can try it at home to verify it works for you. You will, however need a VPN on the firestick. Google that and it suggests it's possible. Setting your VPN source to a UK location will work the same for any country, even at home.
To try it for free, however is the problem. A lot of VPN's have free options but most block streaming or torrenting on their free versions. One that doesn't is Windscribe which will allow 10GB per month if you register your email. That's enough to test it but you will have to subscribe to a VPN to a give you enough data for serious usage.
Steve