losnemo: Reporting back as promised, having called the helpdesk. They authorised a fault detection call-out for the following day, saying I'd probably get a call from the engineer in the morning. No-one ever called, but I doubt anyone was ever dispatched... as soon as I put the phone down, I checked and the modem reported the increased speed, from

Bandwidth (Up/Down) [kbps/kbps]: 4,397 / 10,587

to

Bandwidth (Up/Down) [kbps/kbps]: 3,228 / 16,884

Once again, it never varies; every time I test it reports the exact same speeds. Is this normal for a VDSL connection? Is it possible to 'dial in' a maximum speed against a certain account? It really did seem like someone had got a call from customer support and flicked a switch. They just forgot to flick the upload one as well. There's now a 'compliant' >15mbps DL speed, but for some reason the upload has worsened.

I guess the thing to do is call again, seems to do the trick...