Did this sort itself rp? I've just gone back through my email to find the relevant one. Apparently the 'transit links' were being worked on, which should have been finished on the 17th, and there were upgrades to Marylebone, Norbury, Kidbrooke, Guildford, Newington and Dunfermline exchanges (amongst others, but those are the ones that the email notes).
It also says that potential disruption could continue up to the end of this (last) week, so hopefully all is resolved and well now!
No, still terrible packet loss for me. Doing more tests this weekend, swapping routers, settings, wiring etc etc.
rp2000