The photo below has just appeared on Twitter, added by John Duncan @Newbattleatwar the text is rather general: The other photos are a mix, no date or location. I am intrigued as the Bren Carrier appears to have a Lewis gun mounted.
I'll risk embarrassing myself with a guess! The officer standing second from the left appears to be wearing a Polish uniform, and the chap to his left is not giving a British salute I think, so at a guess this is a photo of Polish troops in the UK - it's got a look of 1940-41 to my eyes at least. That might explain why they are using second line equipment rather than the usual Bren. Gary