solomon bygraves , 29 , was sentenced to 30 months in prison after admitting robbing 93-year-old stanley evans in the entrance to his block of flats in soho , central london as he returned from a shopping trip .
shocking cctv footage played at southwark crown court , showed bygraves following mr evans into the communal entrance of the flat .
the pensioner was then left lying in the entrance to the ground and taking his wallet .