4G router up and running. Difference is massive. Particularly today when ping times have gone to 1s - 2s. Seconds!!
Check out todays BQM - worst by a long way so far:
https://www.thinkbroadband.com/broadband/monitoring/...
https://ibb.co/6YT80PK : Ping test 4G vs Virgin (4G is the one on the mac, my PC behind is on Virgin. These pings are happening at the same time. The Mac is a wireless connection to the 4G router. The PC is gigabit wired to the Virgin router.) Should save me from having to commute to work, anyway!
Thanks for the suggestion, this has probably saved me from going into work. 4G not perfect, still get intermittent lag on RDP, but nothing like as bad as before. Its consistent & good, then suddenly freezes for a few seconds, then is good again. VS Virgin which was just consistently so slow as to be unusable.