I've been on fibre with Plusnet for just over a year now and for most of that time have had speeds averaging 18Mbps down and 2.5Mbps up. In the last week however I have noticed this has dropped by half.......http://www.thinkbroadband.com/speedtest/button/142960538685266366024.png.
The BT wholesale speedtest site says there is nothing wrong with my line and this is the speed I should expect. So how come it's dropped by half after over a year? I might add that nothing has changed on the set up side in the house. I also have several examples of speedtests taken through thinkbroadband over the year to prove I was getting 18Mbps!