sainsbury 's ceo mike coupe handed two year jail term by egyptian court .
embezzlement claim was brought by former sainsbury 's business partner .
businessman amr el-nasharty helped to launch chain in egypt in 1999 .
however venture fell apart and chain left middle east with losses of £ 110m .
mr el-nasharty claims mr coupe tried to seize cheques from him last july .
sainsbury 's supermarket strongly refutes all the claims against it .