Wed 6am: Janet unplugged all DSL modems from the outside world in good time on this occasion, well before a nearby lightning strike (about 1 mile away according to the lightningmaps.org map).
Mid morning there was a lot of packet loss on one line, going on for about an hour and then some smaller incidents.
Wed evening, at around 21:15 or so: internet access went down on all three lines simultaneously, all modems not happy. They possibly (only) lost PPP I think, or else PPP failed to complete the initialisation sequence or something. Going on the evidence of the leds on the modems, it seems there was still some dsl but no ‘planet Saturn’ ? (The Dlink DSL-320B-Z1 manual turns to semi layman-gibberish in failing to explain what that dark Saturn led means, "WAN protocol" - which one? The fools who write these manuals end up with something that is incomprehensible to laymen and those with clue alike.) So perhaps that means dslam/msan (semi-) good but NSBFD exchange stuffed, or no link to BRAS, or BRAS unhappy?
I'm just guessing that this might have been BT doing some work after the lightning strikes.
Service came on on all three lines simultaneously at around 00:11.