Presume it's the cold and miserable weather but twice in a couple of days I've seen a delivery driver parked round the corner in company van having a smoke with parcels on the dashboard, no windows open. Then delivers said parcels to ours and neighbour's houses - mostly gifts for the babies and children in the family so things we definitely don't want smelling of smoke. Two different drivers. Is it legal for them to do so? Is it unreasonable for us to complain?