Richard laughed to himself as he crossed then big main room of his flat from his office by his bedroom on the river side to the three steps down to the foyer on the street side. Despite her telephone call - all the modern witch Susan was - he'd never have noticed her knock if it wasn't for his wards on the building, not to mention the muggle video cameras and microphones watching his section of the street. But it was a running joke of his; muggle salesmen rang the bell. Wizarding people knocked.
"Right luv, c'mon in." Closing the big metal warehouse door behind her, he led the way back up the stairs and to the left where there were several comfortable chairs and a whit leather sofa. "My wards are fine. Unless by check you mean learn how I do them?"