Throttled, or ISP problem somewhere?

Over the last week I've noticed my broadband speed has nose-dived. I have the BT unlimited package (supposed to be 8mb connection, unlimited download volume), I'm close to an exchange (postcode is CB7) but I'm maxing out at around 60k/s now, whereas previously it was in the hundreds - my connection has been fine for the last couple of years (since I signed up basically).

Is there a problem with this exchange, or have BT introduced some traffic shaping?

I'm paying �40 a month for this

1st off goto http://speedtest.btcentralplus.com/ , run the test and post the result

Thanks for that rogan, my result was as follows:

1. Best Effort Test: -provides background information.
IP profile for your line is - 500 kbps
DSL connection rate: 448 kbps(UP-STREAM) 6240 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 439 kbps
2. Assured Rate Test: -provides background information.
Assured Rate IP profile on your line is - 500 kbps
Actual IP throughput achieved during the test was - 573 kbps

IP profile for your line is - 500 kbps

Looks like something may have gone wrong with your connection at some point and its knocked your IP profile down
Read about IP profiles here

If your line rate remains stable the profile should return in a few days.

Ok, so it's dynamically decided at the exchange and it'll get around to checking my max again at some point in the future?

I think I understand.

Thanks.

Well, it seems to have fixed itself over night. I'm back up to full speed .

Good to hear, also if your paying �40 per month for your broadband phone up BT and you will get it for �25.