A cat and a rat, on a roof!

Why had I not spotted before? We've worked in Datchet for over 2 years and I've never spotted the cat and the rat on the roof of Manor Cottages before! Word up is that they are there as a symbol of the bubonic plague - but pictures of 19C Datchet don't show the cat or the rat, so these are probably a bit of fun. If a rat can in any way be thought of as 'fun'.