We found this moth below on the door of the garage, it was around 2 1/2 inches long. We weren’t sure what it was but after a little investigation on the internet we decided it was a Convolvulus Hawk Moth. They are immigrants from Africa and commonly seen in the UK between August and November. 
Butterfly Conservation website – http://butterfly-conservation.org/1866-10974/convolvulus-hawk-moth.html