The cyber-warfare operation was launched by MI6 and GCHQ in an attempt to disrupt efforts by al-Qaeda in the Arabian Peninsular to recruit “lone-wolf” terrorists with a new English-language magazine, the Daily Telegraph understands.

When followers tried to download the 67-page colour magazine, instead of instructions about how to “Make a bomb in the Kitchen of your Mom” by “The AQ Chef” they were greeted with garbled computer code.

The code, which had been inserted into the original magazine by the British intelligence hackers, was actually a web page of recipes for “The Best Cupcakes in America” published by the Ellen DeGeneres chat show.

Written by Dulcy Israel and produced by Main Street Cupcakes in Hudson, Ohio, it said “the little cupcake is big again” adding: “Self-contained and satisfying, it summons memories of childhood even as it's updated for today’s sweet-toothed hipsters.”

It included a recipe for the Mojito Cupcake – “made of white rum cake and draped in vanilla buttercream”- and the Rocky Road Cupcake – “warning: sugar rush ahead!”