The MoD has informed Ofcom of the following GPS jamming exercise:
But deliberate interference with other wireless stations is in breach of the Telecommunications Act!
Of course GPS does not transmit in an Internationally allocated part of the radio spectrum, therefore it is like Radio Caroline, a "Pirate" and on that basis the MOD get away with its jamming trials.
Taking this a stage further, if it is essentially an illegal station, surely all the government depts that utilise it are condoning illegal activity if not acting illegally themselves. Whatever happened to Galileo?