I have recently bought an OBD II cable and various software. It won't connect (maybe I'm doing something wrong) to the TD6 (2003) so far.
I have checked the port setting are OK, used two different laptops. I know the same kit works on the V8 but have yet to find anyone able to say they have it working on a 2003 TD6.
Hopefully this may prompt a solution, and I've posted in a couple of FFRR forums so If I get a reply I will let you know.
Interestingly the kit has connected to my Laguna (2001 Petrol) so at least I know it does what it says on the Tin.
I bought it as it stated it worked with "Landrover" spec vehicles - clearly not a series 1 though!