Grass Snake sighting

This is the third year running that I have seen a Grass Snake on site. In 2020 and 2021 it was on one of the compost heaps which is where you might expect to find a Grass Snake in the summer months, hopefully breeding. This time I found it in the top barn slithering across the concrete floor. I am not sure what it was doing in there - I can only assume it was looking for something to eat.