BitTorrent Question:Traffic throttling?

[Logolepsy]

For months I have been able to torrent with no problem at high speeds with my port opened.

However, recently (or suddenly) my download speed plunged to unprecedented levels. ( Constantly < 10kb/s as compared to before: up to 1200 kb/s )

The problems are:

1) There are many seeders.
2) My settings have not been changed (at all) whatsoever.
3) Trying different torrents have offered no remedy.

I am somewhat convinced and justified to believe that my ISP is playing dirty.

I tried a few measures but to no avail:

1) Changing port.
2) Forced encryption.

And yes, how can I determine in what way are they throttling BT traffic? Eg. Blanket throttling on all encrypted traffic / specific ip throttling etcetra

I am using BitComet.

Thanks =)

 

[Matt]

Like the other answer said, you will have to checkt he terms and conditions

All isps in the uk throttle speeds apart from

sky broadband
o2 broadband
be broadband
Entanet resellers (fast.co.uk , ukfsn and so on)

So if your are not with one of them then the isp is likely throttling.