Thanks for the comments guys
The butt plates with the long tongue are all from the Long Lee, and we have deciphered all the unit markings, (lots of different units..... King's Own Scottish Borders, Royal West Kent, Royal Marines, etc... etc....) It has been speculated that, the plate with 'R Osgood' was actually a sharpshooters personal weapon, hence why his name was on it rather than the unit.
The Thompson oilers are the first we've found at the site, as are the Vickers 50cal belt bits. Never seen them before and were rare, until we recovered that lot!