A bitter legal dispute between the builder of the new Wembley stadium and one of its principal sub-contractors has gone to court in London.
Work is still continuing on the new Wembley stadium
Australian firm Multiplex and British business Cleveland Bridge are suing each other for alleged breach of contract on the troubled project.
The Darlington firm left the project in 2004 after a row with Multiplex and is seeking damages for lost earnings.
Multiplex partly blames its former partner for delays to the stadium.
Multiplex is suing Cleveland - which built the stadium's centrepiece £60m steel arch - for up to £38.5m in damages while Cleveland is counter-suing, seeking up to £22.5m.
The hearing, at the Technology and Construction Court in London, is expected to last at least four weeks.
The contractual dispute is one of a host of setbacks which the £757m prestige project has encountered.
The stadium was originally due to have been completed in August 2005 but its handover date has now been pushed back to September 2006, leading to many events, including this year's FA Cup Final, being rescheduled.