It was quite a shock to come across this large insect, nearly 2 inches long, in the bathroom during a short stay in Brittany. Insect intruders are quite common, but not usually that big. It is a great green bush cricket (or katydid).
See the remarkably long antennae.
Fortunately there was a glass and piece of card large enough to put over the insect to enable its safe removal from the house.