Two Royal Navy ships have been deployed to help get stranded travellers back to the UK. Gordon Brown announced that HMS Ark Royal and HMS Ocean will be made available for the relief effort, following a meeting of the emergency planning committee Cobra in Whitehall. The Prime Minister defended the continuing flight ban saying the safety of air passengers was "paramount" when dealing with crisis caused by the volcanic ash cloud. Speaking at Number 10, Mr Brown said: "Today we are looking at the results of test flights that have been up in the air yesterday and today and looking also at the manufacturers' recommendations, but that will be dealt with by the European Council meeting of Transport Ministers that will be held by video link later this afternoon and further decisions about when flights can go and whether flights can not go." Mr Brown was flanked by Transport Secretary Lord Adonis and Foreign Secretary David Miliband as he spoke.