It is across the network as well as within the connection, but as I said - the network is scaled to make it irrelevant to the P2P, whilst still prioritising VOIP/gaming. That's in the detailed links someone else gave.
I would expect bronze to slow down over the network when Apple release another iOS and lots download it, or Andy Murray is in a Wimbledon Final. I doubt if it is scaled to cater for 5 days a year out of the 365

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From what I've seen over the years, no ISP does that. There were even reports of Zen delivering 500kbps on speed tests not long ago. I don't remember exactly when, it was the Olympics or the Commonwealth Games in the UK. That sort of thing.
The beauty of it is, (and don't forget that Paul says Come are working on the same - my link was to explain what he was on about and why it isn't all bad), that even at times like that gaming and VOIP will still work, and hopefully the streaming that is causing the pressure. For that benefit, I think most customers will say "stuff the internet downloaders on P2P"

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