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If you are a Virgin Media customer then the best speedtest is from the link below which is from a dedicated server within the Virgin Media network, hence the is no www. before the address.
Have you tried going to this link to check your speeds
http://gamefiles.virginmedia.com/
click on blueyondergames>demos>then click on at least 2 large files around 400/500 mb and save them to your desktop, and then wait a couple of minutes then write down the transfer rates on the files that are running> times them by 8 and you will get a truer download speed.
i.e : 250kbps X 8 = 2MB, 500kbps X 8 = 4MB, 1250kbps X 8 = 10MB, 2500kbps X 8 = 20MB
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