Download speed had dropped

[#1]

I'd noticed that my Rapidshare downloads weren't reaching more that 400 kps this morning when I'd expect around 700. Ran a PN speed check which confirmed speed was slow. Peak usage at 1.08GB so no issues there. Before you ask I also performed a BT test. Any ideas why this is happening?
Results of BT Test:
Test1 comprises of Best Effort Test:  -provides background information.
    Your DSL connection rate: 7616 kbps(DOWN-STREAM),  448 kbps(UP-STREAM)
    IP profile for your line is - 6500 kbps
    Actual IP throughput achieved during the test was - 4829 kbps

[#2]

Any help out there? My speed is now varying from around 250 to 500 kbps mark. Something is definitely off though.

[#3]

Please post the results of this speed check http://www.mybroadbandspeed.co.uk/ so we have some actual figures

[#4]

Strange - whenever I've queried my speed in the past someone always asks for the BT speed test to be run as I'm told it's more accurate. The one time I pre-empt that request someone asks for the PN version 
Anyway, my speed seems close to normal at the moment. I'll post back tomorrow if the problems reappear.

[#5]

The BT speedtest has been a bit dodgy lately.
The reason for asking for the other test is that would pick up a problem at the Plusnet end as your BT test result wasn't too bad

[#6]

They may have got it sorted -
http://community.plus.net/forum/index.php/topic,75560.msg606851.html#msg606851
I had quite a sensible result when I tried it this morning.