I have heard this a few times but never managed to catch a glimpse of the actual animal. I’m assuming it is a bird because I believe it is coming from the roof by the direction of the sound. Only tend to hear it at night time. We do have a lot of foxes in the area so I’m wondering if this is an alarm call?
Difficult.
I'm guessing its at the start of the clip.
Can you give any idea of the surrounding land, any woodland, water, etc?
It might help someone ID the sound.
Mike
Flickr: Peak Rambler
If you're very familiar with the wildlife in your area, try the following link to Bird Song UK, they list various calls for a great many species, it may be a regular species with a different call.
If there's nothing that fits, try looking at other very likely species.
https://www.british-birdsongs.uk/