I logged into my router but couldn't find the things that you were saying that you needed to check.
My old isp was only 2mb but were only getting 1 hence the change, so my current internet is faster.
I did a speedtest and here were the results, not sure they are entirely accurate as i live near but a bit of a way from maidenhead.
http://www.speedtest.net/result/387567074.png
And these were the postcode results
According to information provided by BT Wholesale, your telephone line should be able to support a 4Mbps or greater ADSL connection speed via ADSL Max.
Thanks for any help!