In Bristol, this piece was placed on plywood, although the owners of the building -- a boys club in need of funds -- later took it inside, where it can be viewed for a small donation.
And in Cheltenham this piece appeared on the side of a house, apparently as a comment on GCHQ, who responded:
"This is the first time we have ever been asked to comment on art.
"Although we are not qualified critics, we are as intrigued as the rest of the residents of Cheltenham about the appearance of the mysterious artwork.
"For those who are interested, our website gives a glimpse of what modern-day intelligence operatives are really like, although some may be disappointed by the lack of trench coats and dark glasses."
I really need to go on a street art hunt of my own again.