Sound ID: Is this a Chaffinch or a Blue Tit ?

Hey, this should be a pretty easy one to answer, but it's been causing me a lot of confusion.

This audio contains a blue tit song: https://macaulaylibrary.org/asset/304254101

What I'm not sure about are the two initial "wheep wheep!" - is that the blue tit, or is it a chaffinch in the background?

To add to the confusion, I've definitely been hearing that "wheep wheep!" alongside blue tit song/calls when I'm out and about, and I can't tell if I'm hearing both Chaffinch and Blue tit, or just blue tits.