Can anyone tell me any web sites where l can check the speed of my broadband?

Im upgrading it to 24 Mg,I know that the further the home is from the Telephone Exchange the weaker the broadband signal is,hence the speed may not reach 24 Mg.

So, l would like to check how fast it can get ,thank you

Is this web site any credible ?

http://www.broadbandspeedchecker.co.uk/

Or if you have nay better websites where l can test my Broad Band Internet speed?

Thank you