ive recently acquired this ww2 air ministry aircraft hydraulic tester,the frame is in original condition,the engine runs but has been repainted some years ago which now has nice patina on it,im planning on putting it back into its frame to make it complete,therefore I was enquiring if anyone has any knowledge or info relating to it as I seem,so far to be drawing a blank I'm assuming its mite be a rare item as I'm told a lot that were purchased at mod sales were bought just for the engine (petter),greatfull for any help,thanks.