I'm not sure but I think I read an offer somewhere on Backstageboard yesterday. Try it there.
Also keep calling the hotline from www.wembleyticket.com. There are tickets returned from time to time and still a chance to get tix. just keep on trying.
There are also sometimes offers at www.ebay.co.uk but only if you are willing to pay quite a lot of money.
Keep trying Wembley - have heard that they still have the seats near the stage area left - but are holding them back until they know what the stage set up will be.
Don't give up trying and keep trying Wembley.