Il Divo - Royal Albert Hall - Tuesday 17th April - SWAP ?

I HAVE x2 STANDING TICKETS FOR IL DIVO AT THE ROYAL ALBERT HALL FOR TUESDAY APRIL 17TH. I CANNOT MAKE THE TUESDAY SO NEED TO SWAP FOR x2 STANDING TICKETS FOR WEDNESDAY APRIL 18TH. I LIVE IN STAINES BUT WORK IN CENTRAL LONDON SO CAN MEET ANY TIME.