Strange bird call - help

Hello everyone!

Ive managed to grab a recording of the bird call, I’m usually in the countryside where there’s a small pond in a field behind my house, and there are birds that call to each other while on there. I’m having to go back to university so wanted to see if anybody could tell me what these birds were so I could find some recordings of them to help the transition.

thank you!

https://www.dropbox.com/sh/f3ujuvod56w6b1v/AAAlFL8PoapD-auqA58xzdnZa?dl=0

drop box link to recordings of the calls!