You are the legal and entitled person to that property. He may be the gardener but unless he has grounds to be on the property then he must keep off and obey the tenant. For example, most shop policy's where you work entitle to to all staff areas when you are within work hours but outside work hours you ain't covered by work insurance unless invited in staff areas...... Same applies here, not regarding ins but you know what I mean. Tell him to jog on and n xt time you threat to call the popo then call them they will be on your side, point out there is no grounds man jobs to do, no prior arrangement and he is being 'unreasonable' As for leaving s motor vehicle running he can get silly about this and the police must enforce that you cannot leave a vehicle unattended and running for both crime prevention and carbon footprint reasons. I know what a joke but as for the fence I would have sprayed it with the hose some more