Looking at my dashboard stats I can see that although my download speeds peak at at the giddy heights of close to 3.9 Mbps at 11pm through to 5am, they drop to 0.5 to 0.7 Mbps from 5pm to 9pm, and vary at other times but it's usually impossible to watch a video clip ( ironically including BT's own instructional videos of course) without continual buffering, making it impossible for the kids to catch up on uni lectures etc. Anyone any suggestions as to where I might rant to some possible effect?

Many thanks.