Anyone able to identify this bird call?

Hi, we live against Thetford Forest in Suffolk. We’ve been hearing this bird call throughout the day, for weeks now but we can’t identify what bird it is. The recording is me copying its call, not the actual bird. It sounds a bit like “eeyore” but with a pause in the middle. I’ve tried a few bird watching friends who don’t know what it is. I’m afraid we’re really new to bird watching and identification. Thanks in advance.