http://www.idnet.net/solutions/homeofficebroadband.jsp
Can't recommend them enough.  There support is excellent as well mate.  One of the very few ISP's that actually call me back when I ask.  Even out of hours support, say on a Sunday, I've had people call me.  All speak English very well. 
 
1 Month contract as well, so if you have no luck your not stuck. 
 
Really enjoying being with IDNet.  Had a very plesant experience with them for nearly 2 years now.  Had some issues, but like I say, all have been sorted quickly and professionally.