I have an unopened Cardo Systems BK-1 Duo set that I was lucky enough to be given as a present.

It's a fantastic bit of kit, and perfect for a couple to use on the bikes, or a couple of MTB'ers out in the woods.

The cardo BK-1 offers simultaneous conversations via intercom between up to three cyclists, mobile phone connectivity, in-the-ear instructions from GPS devices and MP3 stereo music streaming from compatible devices. Whether you cycle alone or in a group, the cardo BK-1will give your favorite outdoor experience a whole new dimension. The cardo BK-1 DUO includes two pre-paired cardo BK-1 units ready to use.

It retails as £399.99 but I'll accept £300, sensible offers will be considered  1

More info here: