Williams not involved in arbitration

Spyker last week began legal proceedings against Super Aguri and Scuderia Toro Rosso over their belief that the two teams are in breach of F1's Concorde Agreement for running development versions of 'customer cars'.

Although Spyker liaised closely with Williams before the start of the season to discuss their unhappiness at the situation - and it was thought the two teams would launch legal action together - it is understood that Spyker are currently acting alone.

Team boss Frank Williams was not at the season-opening Australian Grand Prix, where Spyker chief Colin Kolles lodged a protest against Super Aguri after qualifying.

Speaking to autosport.com earlier this year, however, Williams said his team were considering legal action over the customer car situation - even though it could be a lengthy process.

"It won't take years. It might take a year, and it might get messy. But maybe Max (Mosley, FIA president) should get more forceful then.

"He did say that he was not involved in it because it's a Concorde Agreement matter. But there are three parties that have signed the Concorde Agreement and he is one of them."