Came across this in the World Naval Ships Forum:
"There is an interesting account of the time AFD4 was at Jarrow Slake on the Tyne during WW1 to be found at www.bb35library.usstexasbb35.com If you follow through the menus to History-North Sea-North Sea operations-20th october-20th November. There is a copy of Smiths Dock Monthly, a works magazine the October 1919 issue, that gives details of the preparation, arrival and vessels docked in AFD4 during WW1"
Tynebuoy had sent me a photo of the dock at Jarrow Slake some time ago but I had never realised just how active the dock had been. See following link for a bit more about the dock.
http://www.tynebuiltships.co.uk/M-Ships ... k1912.html
Looking through old copies of newspapers there are plenty of references in the first years of the 1900s to proposals to base an Admiralty Floating Dock on the Tyne. It took a war time emergency to make it happen.