General consensus...
Well it seems here just about everyone is agreed - it's the ISPs problem.
When plus.net started bitching a couple of years ago that if you were using your connection excessively then you must be doing something illegal, people let it pass when the service they were paying for became throttled, subject to AUP and people got booted off. Other providers followed suit soon after when they realised they could get away with it.
Now people have a legitimate reason to use (lots of) bandwidth and the ISP's have to sort out their shit. Admittedly the problem lies with BT and their pricing model, as discussed in Andrew's Mailbox thread... So we find ourselves in the position of having to pay to watch the BBC (again - like the licence fee isn't enough), because the (heavily regulated) BT have artificially high pricing on their wholesale product/backhaul?
If your business model supports 1-2GB transfer a month (the figure quoted by plus.net as the average used at the time), then you make that the data allowance advertised/allowed in your rock-bottom-no-frills service. Tiscali don't seem to be able to support checking Hotmail at 6PM so I suspect their usage allowance is even lower. Right about now you'd expect the ASA to step in and stop people from advertising an "unlimited" product that quite clearly isn't...
Nevermind the fact that the BBC has the iPlayer and it's a bit popular, doesn't YouTube account for something like 10% of all Internet traffic? Will they go to Google and ask for a hand-out... not likely they'd get told to f*ck off in no uncertain terms! The BBC is just seen as an easy target.
Perhaps if Tiscali didn't spend so much on wanky ads and trying to buy market share they could spend some cash on actually providing the infrastructure they're over selling...