This is known for being something of a fragile area. Here's a picture of the earlier dangerous face being blasted away in the summer of '76, to stop it falling on the Portway. Every year the Portway is closed for a day or two to allow for a close inspection that can lead to the planning of remedial works. I'll often get a bit of notice of this, as they have to put the warning signs up quite early down in Hotwells so people can plan their alternative routes.
GPS Coordinates:
51.46829, -2.63327
Location: Sneyd Park and the Downs