hi stamp
those speed figures are awful, even if you are still on 150K, you should get 150K, yours is at least half what it should be. It could be caused by any number of things e.g. your MTU or proxy settings.
any chance you could do this speed test & post the results? - delete your 'personal' info before you post btw
http://www.vantage.pwp.blueyonder.co.uk/v2/v2.htm
Gaz