Speedtest.net is not to be trusted st the best of times, use Magnet or UPCs own test:
http://speedtest.magnet.ie/
http://www.upc.nl/internet/snel_internet/speedtest/
UPC contention ratios are on the up right across the country due to a high uptake in cable broadband (I recently had a detailed discussion on this point with a UPC network engineer). I started off with 20Mbit but downgraded to 10Mbit after a few months due to flakey service and not being able to get anywhere near the elusive 20Mbit. Note that UPC also throttle certain bandwidth intensive traffic on their network core, this may not be your thing if you have a tendancy to download the likes of Linux distros via Bittorrent for example.
CJ














