I've received an email offer for best seats for the Concertgebouw's concerts at the Barbican on 11th and 12th June for £18.50 instead of £45. Can't understand why this isn't selling - both the Concertgebouw and Mariss Jansons usually manage to sell out concert halls individually, and it will be their first London concerts since he took over as principal conductor. It's also repertory which I can vouch for him being very good at.
If anyone's interested, drop me an email and I'll forward the offer to you.