Solved! Go to Solution.
maybe install a VPN app such as TunnelBear or HotSpot Shield if you can through the Play Store. Then fire it up and change your locale to UK (if possible) then FC the Play Store, re-open it (while the VPN is running) and try to install Spotify.
Else you may just have to use the sideloaded apk from Peter's link above and when you're home install the version from the Play Store over the top.