I've had a nightmare with this today and don't want other people to waste their time on the same thing.
I was getting "LCP No Response" errors, and after many hours of testing with different bits of hardware, I discovered the firmware was at fault. Both the UK firmware versions were incapable of forming a connection (2.02t8 and 2.12t1. The solution? Download the latest firmware from Dlink Australia (www.dlink.com.au) and use that instead. Just add a profile for the UK DSL settings (VPI:0, VCI:3 and you're off - it works like a dream and the responsiveness is 2-3 times faster than the UK ***** too :-)