My Lords, I promise that this is my last intervention but I could not resist this one. Some years ago I was asked to chair a Select Committee on aircraft travel and health and deep vein thrombosis. It was an unusual piece of work because it was based on anecdotal evidence that people were coming off planes and were in hospital shortly after. It was unusual because most of the evidence that we took was from the general public, and we then got the reaction of the airlines, et cetera. So this is an area that I know very well indeed. As to whether it is relevant to this Bill right now I do not know, but at that time, the answer was that you could tell people that you had something wrong with you—the flu, or an allergy, although I am not sure that everybody thought so much about allergies in those days. There was great use of hyperfilters, which are still relied on. The air exchange is so quick and so localised to you that, generally speaking, you are safe because you are only within the range of one or two people. I advise the noble Baroness to get a copy of the Bill because it is quite possible, having listened to her today, that she might want to take this forward herself.
It was interesting to hear her speech. I have no doubt that the Minister has a wonderful answer, but as far as I know all the big airlines used the hyperfilter system and air exchange, which was so fast that it was pretty well the best they could do at the time. Things may have moved on since then. I do not know whether it is relevant to this Bill at this time, but it was excellent to hear the noble Baroness speaking about it. It is the first time I have had an exchange with her and I have enjoyed it, so thank you.