This is the idea:
Get some threaded rods and cut them up in to 4 lengths (Screwfix sell this)
And some M8 Nuts and washers.
The wall is made of lath and plaster so it needs to be braced. The picture above explains it well.
This is the bracket I am looking at getting: http://www.av-sales.co.uk/OLB05-191-26.htm
The yellow bits either side of the wall is plywood - around 10mm thick