Personally i dont see any reason to lock or delete this thread. Its a legitimate request and hes been given good advice.
The cables for sale on that site are knock-offs, using hacked software, and certainly arent worth £80.
If you want a proper genuine lead that will work on all models, then as said above speak to NHN and get one sorted out.
If you want to save some money, and are happy to only have the lead work on older cars, then a cheaper option is to buy a normal £10 cable from ebay, and pay the $99 registration fee to rosstech to activate it. This gives you most/all of the functionality you need on a B5, but will be less useful on newer models.
I believe rosstech also have a scheme whereby if you register it now on the $99 scheme, then later decide to buy a full interface, they'll discount the $99 off the cost of the full lead, which seems like a good option, as you get all the functionality you need for now, and have the option to upgrade without losing the money already spent should you later buy a newer car that would benefit from a full lead.