I'm not fully into the explanation, but apparently it is that they have too many torrenting stream so the upload gets saturated. Preventing the ACKs for all traffic getting through. Therefore the downstream self-throttles.
This in fact seems to be a ploy used by BT Retail to restrain torrent speeds even when they aren't technically throttling the downstream. They throttle the upstream for P2P, thus to some extent achieving the same result.
The user solution, (excluding the BT ploy), is to limit the number of seeds they take, to the level at which there is free upstream.
My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet Extra Fibre (FTTC). Sync ~ 54.0/14.9Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Connection - Plusnet Extra Fibre (FTTC). Sync ~ 54.0/14.9Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.



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