I thought that might be the case. Funnily, over the last 24 hrs+ I've had two changes of IP with first a slight increase in sync, then this p.m. the upstream margin went haywire from 16:25 to 17:55, ranging from 15.5 to 3.7 (normally 8) and upstream sync has nearly halved. My connection is quite benign usurally.
Digressing, neighbour now has a big hole, a shallow trench and a lot of blue pull through for his fault I wasted a thread on. All that appeared yesterday. According to wifey early today separately two OR vans came, looked and went away. I guess it must be the remotest of remote chances his fault could now be playing on me.