A Grate or Gully is an open drain with grate designed to overflow outside if a sewer blockage occurs (the opening must not be obstructed).
We were sitting in car park at St Pauls school just after signing contract on house trying to work out where we were going to get an inspection from, when your man Tony drove in to pick up his kids in the sign written car, so we chased him in car park and got a brochure and an inspection done 9 days later very happy prompt service.