On closer examination it was on the floor behind our barbecue along with a dead young female blackbird.
Looking at the window, which was cleaned a couple of days ago, there is a clear contact mark.
The bird has obviously flown straight into the window and dislodged the weather station in its death throes. Mystery solved!!
Looking at the pressure readings I think the weather station is like the Blackbird deceased!! So if you see another Elizabeth you better acquire it!!
