A four day protest is expected to begin this morning outside the Government's monitoring centre, GCHQ in Cheltenham.
Police say they may close Hubble Road around the site to deal with the planned protest by the UK Anonymous group. The action is taking place against surveillance of the public by UK and foreign Governments.
Cheltenham Police are asking any residents with access problems to contact them on the day.
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Pupils at Hayle Community School launched the pasty as part of a project they are undertaking.
After a dry end to the day, it will grow colder overnight with a light breeze.
It will turn chilly tonight with largely clear skies and light winds.