I'm on an OpenReach connection to giganet. Their status page indicates an issue with CityFibre but not OpenReach.
However I've been seeing some variability.
For example many speedtest servers are now maxing out around 150-250 Mbps 0 (across all devices including wired). Vodafone UK, Swish fibre, Trooli, and MANY others (>50%) are currently giving < 1 Mbps, whilst some are > 500 Mbps (my contract speed) - at least last night, I can't find a single one getting that fast right now!
Many sites are still giving low consistent ping times (IPv4 and IPv6) , but others (ie tiktok) are behaving erratically.
So looks like some kind of routing issues in their core network? It's quite hard to pin down....
I initially thought it might be the router (eero) and was going to flip to my backup (fritz), but the fact some sites are as fast/consistent as ever seems to indicate the HW my end isn't the issue.