The aircraft was undertaking a charter flight from Sharm-el-Sheikh, Egypt (HESH) to Dublin on behalf of Thomson Airways, with the call-sign TOM 205.  Just after the aircraft touched down on Runway (RWY) 10 the flight crew reported to Air Traffic Control (ATC) that they saw ground equipment right at the runway lights at the edge lighting here.  The flight crew elaborated that what they had seen was a lone tractor lawnmower.