Strange Night Time Whooping Call

Last night I heard a very loud waaah waaah call coming from the woods by my flat in north Bristol.  It went on for about 40 mins from 22:50-23:30ish.  It was as loud as a person shouting and shortly before finishing, there was a fainter call in answer to it.


There are quite a few tawny owls in the woods.  Do they have that sort of call?  I managed to record it and could try to download and post to here.