I chose Speedtest.net to perform the tests and from there I used the Maidenhead and Dublin servers to test against.
The results were (download/upload):
- Standard speed to Maidenhead = 544kbps/528kbps
- Standard speed to Dublin = 619kbps/528kbps
- Flexed speed to Maidenhead = 692kbps/527kbps
- Flexed speed to Dublin = 652kbps/530kbps
If I lived in an area with better lines, nearer to an exchange, this model would be great because you could just flex up when you need to download a big file. I wouldn't be surprised if some people could double their connection speed for that 5p! For me, unless BT get their arses into gear and sort out their infrastructure, I don't think that there is much point in me flexing again.