Western Roof Heron

I remember quite vividly driving down Barn Street in Haverfordwest one morning a few years back on the way to work, dawn had broken, and on the roof of the old chapel/antiques place (now heading for dereliction) was a Grey Heron - I had a quick double take to make sure it wasn't a plastic one! It's quite a high roof so could potentially see a few ponds from there.