you missed a bit from the BT speedtest I think, mine says
Download speedachieved during the test was - 2269 Kbps
For your connection, the acceptable range of speeds is 600-7150 Kbps.
Your DSL Connection Rate
:7616 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
IP Profile for your line is - 6500 Kbps
attenuation downstream: 42 db should see you connect at ~6M or so. Is this measured in the test socket behind the master faceplate ?
MaxDSL - goes as fast as it can and doesn't read the line checker first.
Are your kids pirates ? Limewire, Bearshare, Kazaa, BitTorrent, eMule are all tools of the trade.