As Leon-1 pointed this out
Just a little one for you, if you "save picture as" in your thread on what type of bird it is, it asks if you want to save it as "Water Rail".
I thought I would put up the answer
i wonder how many of those who got it right, had sussed that out
It is indeed a juvenile Water Rail. Below is a picture of an adult I took during the winter.
Well done to those who got it right!