Yeah,UK here and a couple of times I get errors about not being able to connect to the relay server in London + Amsterdam

But I’ve to ask. Have you setup the Tailnet with this fix for IP Forwarding on a subnet router (this helps me so much for tech support on said Tailnet…) and also UDP

tailscale.com/blog/quic-udp-throughput

I’m currently on my phone but I recall having to ensure the Mini PC w/Ubuntu down at their house had both the above when bringing Tailscale, up.