For several months, Streatham Hill station has been undergoing building or renovation works. I think it's to do with the sidings/loco sheds but it also affects the passenger parts of the station, such as a temporary exit and entrance.
This sign bugs me. I'm not entirely sure why, but I think it's because it seems inadvertently to imply that 'Safety' is of no concern on the platforms or even the actual rail track.