Thanks, I have actually just found out the problem -it is that I have a BM53 (which is the US Spec with no TMC) and actually I need a BM54 (EU spec with TMC).

I have the MK4 sat nav (v32) and the 2009 maps with the TMC info on it, but now need to try to locate a BM54! If it's going to cost £300 then I think I'll do without it, but I am looking in scrapyards to see if i can find anything!

Can anyone out there help with a reasonably priced BM54? Alternatively I have a BM53 (ahem US spec) and a MK3 sat nav with 2005 orignal discs to trade with!

Thanks,
Ed