Sounds like a Corncrake ?

…walking along a rural canal towpath in Nottinghamshire. Across the canal, a small area of mature woodland, a country lane and arable farmland all round.

 

Couldn’t see it but the call was something I've not heard before – bird was concealed in the wooded area - sounded a lot like this…

www.british-birdsongs.uk/.../

 

…in particular, the constant repetitive nature of the call was distinctive – it continued for much longer than the bird in the attached sound clip.

sadly, no chance of seeing it.

 

Does anything else have such a repetitive rasping call?  I've listened to partridge calls but they don't seem to match the constant repetitive bit.

Best regards