Before I got to the bottom of the thread I took a look at their site. It's just another WBAC bunch of chancers at best and fraud at worst.
Autotrader can go to the domain authority and raise a dispute, but if it's registered outside of the UK it will be a PITA for them.
Nice shiny Zed on their homepage though...
EDIT - This from the ICANN page. Basically sue them and tell us the result. (Unless you're Apple etc)
All registrars must follow the the Uniform Domain-Name Dispute-Resolution Policy (often referred to as the "UDRP"). Under the policy, most types of trademark-based domain-name disputes must be resolved by agreement, court action, or arbitration before a registrar will cancel, suspend, or transfer a domain name. Disputes alleged to arise from abusive registrations of domain names (for example, cybersquatting) may be addressed by expedited administrative proceedings that the holder of trademark rights initiates by filing a complaint with an approved dispute-resolution service provider.
To invoke the policy, a trademark owner should either (a) file a complaint in a court of proper jurisdiction against the domain-name holder (or where appropriate an in-rem action concerning the domain name) or (b) in cases of abusive registration submit a complaint to an approved dispute-resolution service provider (see below for a list and links).
