LONDON FILM FESTIVAL - VIGGO MORTENSEN - 2 tickets at £17.50 each for sale ?

2 tickets to the already sold out American Express Screen Talk with Viggo Mortensen at the 2012 London Film Festival. It is at the BFI Southbank (Screen: NFT1) on Saturday 20th October at 5,45pm. I have 2 tickets for this which I cannot now attend. Tickets cannot be returned for the Festival for either exchange or refund hence the sale now. Tickets were sold for 17.50 each for this event and I would like to sell the pair for 35.