Low oowoowoo

I'd have thought wood pigeon, they are quite early callers.

You might find British Bird Song quite helpful, and start with the more likely garden birds before venturing to the more exotic calls.

https://www.british-birdsongs.uk/

To upload a sound file, try the following

First, you need to select "Use rich formatting" located at the bottom right of the textbox.

Using the tabs at the top

1. Select "Insert"
2. Select "Insert image/video/file"
3. Where it says "From" select the source, "Web (URL)/File upload/Community search"
4. If you use "Web (URL)", then all you need to do is insert the link
5. If you choose "File upload" then upload a file from your device or computer in the normal way by selecting the computer/device drive, folders and file.
   1. NOTE: If you are uploading a photo, you can change the image pixels at this point before the final upload.
6. If you choose "Community search" using the search tool, search for the relevant posting.
7. When you've made your selection, select "OK" to post/upload, or if you've selected the wrong file/link etc, then select "Cancel"
8. To select the next file or link, start the above process again and for subsequent uploads.

My impression :D and my apologies haha! Listen for a laugh at least! 

And it was deeper than what I could do

LucyOaks said:

community.rspb.org.uk/.../20220821_5F00_092243.mp4My impression :D and my apologies haha! Listen for a laugh at least! 

That sounds very much like a wood pigeon, (or possibly feral pigeon), even though it was your voice.