Anither vote for 3 5G Mobile Router... It sits on the window ledge £29pm and get 60-70 Mbps . Only downside is if there is atmospheric issues affecting the TV signal... ,not often. .. with a 3 sim card. As for e-mail just generated a couple of Yahoo addresses.
Then just monitor your 'old' e mail address and see which you really need to update to your new address...
No wires or water damaged outside cables