SPIES can grab pies at a new Greggs in Britain’s surveillance base GCHQ.

The sandwiches, cakes and bakes giant is setting up shop at the top-secret complex.

2 GCHQ are keeping quiet about the new Greggs in their building Credit: PA:Press Association

It will be the national chain’s fourth outlet in Cheltenham, Gloucs, and will serve hundreds of staff who monitor cyberspace around the clock.

Last night bosses at the complex were even trying to keep news of the new spies sarnie stand a secret.

A GCHQ spokesman said: “We have no comment to make on these reports.”

Work carried out by staff inside the sprawling centre crammed with hi-tech equipment is classified.

2 Greggs will open its fourth branch in the Cheltenham area inside the nation's security HQ Credit: PA:Press Association

Security is famously tight and Greggs staff will not hear any state secrets when they serve the spooks.

The snacks company also refused to talk about the GCHQ venture.

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But it is believed it will open next to two existing Costa coffee outlets.

A Greggs spokesman said: “We also have no comment.”

The firm’s hundreds of shops include ones in hospitals, airports and rail stations.