Well, maybe it's not literally on GCHQ's doorstep...
But Cheltenham, the home of the UK government's listening post and communications surveillance headquarters, has had a night-time visit from what appears to be the famous street artist Banksy.
The mural was spotted over the weekend, having been painted on the side of a house on the corner of Fairview Road and Hewlett Road under the cover of the night, according to a report in the Gloucestershire Echo.
The art - which frames a public telephone box - shows three stereotypical spies, wearing trenchcoats and trilby hats, carrying old-fashioned listening devices.
Karen Smith, who lives in the property, opposite the Fairview pub said she heard noises through the night but thought nothing of it, as Fairview is a busy area.
The mum of five, 48, said she got up at around 7.30am on Sunday morning to find a van parked at the side and some men packing away this white tarpaulin.
“They were taking it down and putting it into the back of the van. I thought it might be something to do with the police, like when a crime happens. I saw these people looking and then saw the graffiti."
No doubt plenty of people will be stopping by that telephone box now to make a phone call and (more likely) to get their photograph taken.
Image credit: rowhills on Instagram