Paging Warhammer fans etc.

One of my nieces works in a charity shop which has been given a lot of figures which I think are for Warhammer 40K. I'm very out of touch with the system, I'd be very grateful if anyone who knows more can give me an idea what army etc. they are (or tell me if they aren't for W40K) and give me a ballpark figure on a plausible second hand value for them, per figure or as an army or something. Sorry about the quality of the pictures, I think she used her phone and scaled them down to send them to me.












Many thanks!