Hi all,
Well the last UFO wasn't specifically identified so hopefully we can have a come back with this one. Ok what I know about this one is that it's almost certainly from a British aircraft (from some numbers and the colour) and it's a hydraulic ram for some purpose.
Additional to the numbers shown in one of the photos some other numbers that I noticed seemed to be BS4117 and BS1606. Good luck.
Cheers,
Matt