Is the car still under warranty I believe that most recent Vauxhall s come with a 1 +2 year warrany.
Might be worth talking to the Vauxhall dealer if not covered by warranty they my be able to put a goodwill claim in on your behalf-- assuming its a manufacturing defect.
Springs often fail as the ends are cut in manufacture(rather than formed) and then rust gets in.
worth a try
Maurice
March 2010