What bird is this?

I use the freephone  app BirdNET to help identify. Might be worth a try. I ran your recording against the app a few times and had suggestions of possibly a European Robin, and possibly a Dunnock.

If you can’t see the bird It might help if you give us some more details like habitats and location you were in. That can also help with identifying bird calls. Where were you when you heard the call were you in the UK or outside the UK? And what habitat where you in when you heard it. And what habitat was nearby like woodland, garden, or park for example.
Where were you in when you heard it?

Many thanks for that suggestion but we have used that app and can't find a match. However, through friend we've been helped by the bird office for Oxfordshire and he's very sure it's a Northern Bobwhite quail. Originally from N America, apparently they're often kept in aviaries in this country (S England), so it's likely to be an escapee (probably more than one). Here's a link to it on birdnote.org: www.birdnote.org/.../calling-northern-bobwhite

We're pretty sure its a Northern Bobwhite quail, probably escaped from someone's aviary. Apparently often kept n aviaries. Here's a link to the call: www.birdnote.org/.../calling-northern-bobwhite
Many thanks for all the help.

It sounds like a Bulfinch to me.

If you recorded it on mp3 you can upload it by pressing the landscape icon and then open files or browse and clicking on your mp3 file. But If it’s a video of the call then you would click on the landscape icon and then photo library to add it. If it’s not a long video  then it will probably let you send it. If it is a long one it might be easyer to upload it to you tube then copy link  and send it for us to watch.

You have to click on 'Rich formatting' otherwise it's just a blank box.
Set it to load up the clip straight from my phone, but that was an hour ago and nothing happened yet. Presuming it's too big, but no prompts on the screen.

You have to click on 'Rich formatting' otherwise it's just a blank box.
I set it to load up the clip straight from my phone, but that was an hour ago and nothing happened yet. Presuming it's too big, but no prompts on the screen.

Many thanks for all the comments and suggestions. We are sure it IS a Northern Bobwhite. Actually managed to see it a couple of days ago, perched in neighbour's tree. Probably escaped from local aviary but no-one's owning up, yet!