It's a floating cider bar, normally moored near Bristol Bridge, hence the name. It seems very small for the dry dock here. They once launched ships so big from here that one of them (MV Dumra) collided with Mardyke Wharf, opposite, with enough force to stave in the harbour wall and buckle the railway lines. Not much danger of that from the Apple, I'd think.
There's no date on the Dumra picture, but [she was completed in 1922, so I think that must bt the year the photo was taken. Unless they had to reel her back in, fix her and re-launch her.
GPS Coordinates:
51.44787, -2.60879
Location: Hotwells & Harbourside