London's Court of Appeal on Friday ruled that Barclays and Deutsche Bank played a role in the global manipulation of LIBOR.The decision could open the door for more companies to bring action against banks over rigging LIBOR, the interest rate which is used to price over $300trn of financial contracts worldwide. Barclays is being sued for up to £70m by UK residential car home operator Guardian Care Homes for allegedly mis-selling interest rate hedging products based on LIBOR.Deutsche Bank is being counter-sued by India's Unitech after the bank launched a lawsuit against the property firm last year for the repayment of a $150m loan and a related $11m interest-rate swap. Unitech said the loan and swap deal were linked to LIBOR interest rates.The two cases are expected to go to trial next year.Deutsche Bank said it would launch an appeal against the decision while Barclays said the allegations were without foundation.RD