I can't help with your Torrent speed issue but I have recently installed a similar Belkin unit for a friend (it is a uk4 NOT a uk4A and the version is 3011. However I have ugraded the firmware from the Belkin web site. The ISP is also Pipex.
Our problem was getting the modem to connect reliably to the WAN (ISP). I thought it should connect automatically on power-up (like a cheapo one that I own) but I can only get it to connect "on demand" (ticking the check box on the second page of the WAN set-up, Outlook or IE triggers a connect. This takes about 20 seconds to connect during which Internet Explorer shows "page not found". Outlook seems to get ther quicker, don't know why.
Just wondered how you connect and if you are familiar with the settings I mention. "Connect on Demand" is not checked in the default settings but it is the only way I can get it to connect. Phone calls to Belkin technical support have not clarified the issue for me.