Blenheim Palace and Gardens family tickets +

Hello, I have a family tickets (2 adults plus 2 kids) for Blenheim Palace and Gardens, valid until Dec 2012. This can be used at any time and also you kids will received goody bags at the entrance. Only valid for one use (not multiple entry). The face value is GBP 60, now selling for GBP 40. Please let me know if you are interested. Thank you