So it turns out that our chickens like the rain. In fact, I think they may actually be ducks with an identity crisis.
They don't seem to like going inside during the day, so I've provided them with some more cover in their run outside, but to no avail:

(That reminds me, must get my tickets for Glastonbury booked soon!

)
So come on folks, put my mind at rest - is this normal, or are they going to catch their death of cold / bird flu?

Cheers!!
Womble.