2 x Secret Garden Party tickets at £135 each, below face value ?

I have two tier 3 full camping tickets for the Secret Garden Party. I live near Tonbridge and will be in central London on Monday 16th July. Sadly will now be in Greece! I want 135 each, face value 165. I have also booked a self catering barn in Huntingdon at 45 a night if anyone is interested.