BT Broadband suddenly very slow on Mac OS X 10.5.8

Hello,
I'm posting on behalf of my dad as his broadband is now so slow as to be almost unusable. He lives in the Suffolk countryside but should still be able to receive broadband speeds of up to at least 1.5mb/s on his local exchange. His BT broadband service has never been brilliant but has recently slowed right down. He has an iMac 2.66 Ghz Intel Core 2 Duo running OS X 10.5.8. He has tried upgrading to a BT Home 3.0 router but this has not improved his broadband speed. I have tried to run the BT speedtester but I can't get it to work because it says Java is not installed despite it appearing to be enabled as a plugin. I have tried this in both Safari and Firefox. I have asked him to try the speedtester available on the uSwitch website which has recorded a download speed of only 0.2 and upload of 0.1mb/s.  I would be very greatful if anyone has any suggestions as I am going to visit him tomorrow. I intend to try plugging the hub directly into the main socket via a microfilter. I also plan to try upgrading his operating system to snow leopard but I doubt that this will improve his connection. The quality of the phone line seems to have decreased recently too.  Is my only option to try ringing BT customer services?
Thank-you!

Hello,
Have upgraded to Mac OS X 10.6.3 and now able to run BT speedtester:
Also here are hub stats:
Ran Uswitch speed tester again:
This suggests that we should be able to get up to 2.5Mb on this exchange.
Have tried quiet line test, line is not silent, there is low level interference on wire connected handset. Have tried connecting hub directly to master socket which has given a slight improvement in performance but still to my mind unacceptably slow. Could not repeat BT speedtest as limited to one test per hour. Ran Uswitch test again:
I know that he has just changed from Hub 2 to Hub 3 and it will take time to settle but broadband speed had already declined notably (to the point of being barely usable) on Hub2 before switching to Hub3.
Any further advice gratefully received....

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    Alberto
    ps. just for fun: I am getting a faster transfer rate from an old power pc ,and old pc, and firewire 400 and old ide disks!!! (36MB/seg!!!)

    Yup.
    BThe latest Mac Pro are better, so if you have a new or 2 month old unit, Seagate should work, though I think there should be later firmware.
    Some would say those drives take the cake or woRSe.
    http://www.barefeats.com/hard91.html
    SEAGATE PUZZLES
    +Firmware version 3.AEE or later solves the slow sustained large block write speed issue for a single 7200.10 inside the Mac Pro.+
    +The remaining performance issue is slow small random read speeds for one, two, three or four drives. No matter how many drives you configure in RAID 0 sets, the average random read speed for combined block sizes from 64K to 1024K is less than 30MB/s (based on QuickBench 3 testing).+
    +Until Seagate fixes this, we can't recommend the 7200.10 series as the ideal boot drive for the Mac Pro (or Power Mac).+
    http://www.barefeats.com/quad08.html

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