The attack on the British embassy in Tehran and the expulsion of Iranian diplomats from London propelled UK-Iranian engagement into the deep freeze. But in the world of television, relations have been frosty for some time.

Press TV is a glossy, English-medium channel that comes under the umbrella of Iran's state broadcaster, the IRIB. In the UK it is available on the Sky satellite service.

The station's high-profile presenters include the former MP George Galloway and, until earlier this year, it counted on the services of the former London Mayor, Ken Livingstone.