Five directors of restaurants in Yeovil, Cardiff and Newport are the latest to be banned from running companies for knowingly employing illegal workers, following investigations into three restaurant businesses by the Insolvency Service.   Abdul Boshor (43) and Samiur Rahman (24), who ran the Empire Restaurant (Cardiff) Ltd, signed undertakings banning them from acting as directors for seven and six years respectively. Abdul Kayum (46) and Rothna Begum (40), who ran the Akash Indian Restaurant in Yeovil, signed undertakings for…