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**ALL ROUND PICTURES FROM SOLARPIX.COM**.**NO UK NEWSPAPER PUBLICATION **UK MAGAZINE PUBLICATION ONLY** AND NO PUBLICATION IN FRANCE, SCANDINAVIA, AUSTRALIA AND GERMANY** .Six campaigners against the expansion of Heathrow Airport unfurled banners from the roof of the houses of Parliament in central London today. The protest which  ended after almost three hours, has raised fresh questions over security at the Houses of Parliament, because the group managed to dodge security checks and gained access to the roof via a fire escape. ..JOB REF: 5848 SFE       DATE: 27_02_2008.**MUST CREDIT SOLARPIX.COM OR DOUBLE FEE WILL BE CHARGED* *UNDER NO CIRCUMSTANCES IS THIS IMAGE TO BE REPRODUCED FOR ANY ONLINE EDITION WITHOUT PRIOR PERMISSION*