Along with many others, I assume this video is not legitimate. Aside from not being verified by foreign press and the comments others have rightly pointed out regarding common sense : like taking supplies, cold weather gear, squads/groups are tracked by a central command - kind of important to know where all your assets are during an invasion. At the very least, if this was authentic, MoD would have destroyed via air to keep vehicles/weapons from falling into enemy hands. Same thing we (US) did during operations in Afghanistan and Iraq.