bird id - tree sparrows or warblers?

These birds were seen in a heath-like environment on the edge of a valley. I see the ones with cream white breast often and was sure I'd posted pics on this site for id before but can't find any record of doing so. I have called them tree sparrows because it seems the most obvious, and I think at least one of the birds is a tree sparrow, yet the two that are seen with cream whhite breast yellowish beaks and slight yellow stripe across the side of the head do not look like tree sparrows. I've added a youtube video I took of the birds, and some photos which unfortunately aren't the greatest quality.

 

House Sparrows.

 

Thanks. Video title duly changed!

 

I thought those ones with the black bib were house sparrows, I get a lot around here.

But then to me any small brown bird is a sparrow.

 

Sorry but they're not House Sparrows.

 

They are House Sparrows.

 

@KFF clearly about 40 seconds into the video you can see, at the back, a male House Sparrows grey head!

 

Sorry, I can't see the video.
I was just going by the colour. I've never seen yellow chested House Sparrows.

 

The mystery thickens...

 

Why does 'the mystery thicken'?

 

Below is a female House Sparrow, I believe this is what you have in your pictures @SimonZ. Would you agree @strongylodon?

 

They look like house sparrows to me. There are around 20 or so in my garden, lovely little birds . They fly to greet me when I return home, just to let me know they need feeding. Also peer through the house windows to get my attention.