A guest on Antiques Roadshow was left in a 'state of shock' after being told how much a poster, that famously hung on the wall during John Lennon and Yoko Ono's bed-in, was actually worth.

Lennon and Yoko Ono, who had recently married, held their second "Bed-In for Peace," staying in bed for eight days and receiving considerable media attention. The recording session occurred on day ...