"But in a statement BT said it was not capping speeds down to 700kbps on iPlayer.

The firm said: "Where we manage bandwidth, we do so in order to optimise the experience for all customers, whatever they want to do online."

said by TKJunkMail :

BT:
While it won't make users feel any better, BT denies they are throttling YouTube or the BBC's iPlayer, but are slowing down bandwidth speeds across the board during prime hours due to limited infrastructure.

Sounds like the BBC is trying to bring in a net neutrality boogeyman to put pressure on BT, even though that appears to be a bogus charge.