you tube and other websites work perfectly fine, but the BBC ones suffer of horrible delays ...
That would be terribly pathetic.
Even $ISP, who don't have a great reputation with customers, make positive efforts to make iPlayer work as we couldn't live with the complaints if it didn't, even if we don't like its bandwidth consumption. They think there is a degree of prioritisation of iPlayer traffic, but I'm not sure of the details.
Only thing we definitely crap on is P2P during peak traffic periods.
The black chickens were for dialup.