The piece I saw on Sky News last night around 5pm (and it sound likes the same one referred to in the original post) was done by Retd. BA Capt. Eric Moody (1982 Jakarta Volcanic Ash 747 fame) . I thought he explained the ILS and general loviz ops in layman terms quite well.......although must admit I was surprised to hear the bit about a/c on the ground interfering with the ILS..