To run the BT Speed Test you must have Java installed, Once you have Java installed close your web browser and open a new browser page and return to the speed test site.
Your page will look like this.
You will then need to confirm that you have done steps 1 to 4 in red and ticked the 'Yes' button.
You can then run the 'ADSL & Fibre to the Cabinet (FTTC) Diagnostics' by clicking the button.
You will then be presented by this page:
Here you must enter you home phone number including STD Code no spaces. Leave the Service ID field blank. You will then have to confirm that the number entered is your phone number.
And the speed test will finally begin. Be patient as this test can take a while. It will test your current connection speed, maximum possible speed to the cabinet and what your ISP has set you at.
An example here:
Right, here are the important bits.
'Download Speed' shown here as 6.13Mbps is the actual speed you are getting right now, this can vary depending on how busy the line is.
'Max Achievable Speed' shown here as 7.15Mbps this is the best you could ever get on your line as it is now as long as the sun is shining and the wind is blowing with you. (^_^) It should be a little bit lower 1Mbps or there abouts than your connection rate for data over heads.
'Your DSL Connection Rate' (8.13Mbps) is what your actually connecting at. Up streams (448Kbps) shows what you can potentially upload at.
'IP Profile for your line' (7.15Mbps) This is what your ISP has set your line at you will only be able to get up to this speed as it is set by them, you can however phone them and ask them to increase it. They will normally run a retest which will take a few days. It will increase your lines speed and work out what is the fastest speed that your line can take and dial it back a little for over heads (the difference between your 'Connection Rate' and 'Max Achievable Speed').
I hope this page has helped you and don't forget that if your not happy with your service from your ISP you can always call them or change ISP but at least now you know what your line should be able to take where you are right now.