I was hoping, from the title ("Geo-Unblocked") that this would be about arranging an IP address block that wasn't associated with the UK, rather than just selectively running some traffic through a VPN.
I don't think that would work though. If you changed your WAN address it wouldn't be dissimilar from changing your IP to a different schema on a machine in a given network, no? It just wouldn't work at all.
If you're your own ISP you can be wherever you want to be
https://blog.lyc8503.net/en/post/asn-5-worldwide-servers/