A friend who is on 24 hour O2 went to collect her Mum from Gatwick today and had huge trouble convincing the police it was oxygen, she was not a terrorist and that she could not just leave her O2 in the car and come back without it. With the spotlight on cylinders being used in bombs it is probably not the best of times to be seen with a cylinder and I can just imagine the policemans faces should they spot checking some users cars! Not sure what can be done about it, she called her supplier and they offerered to do her a letter and her GP said the same and she is now carrying photo ID as well, but most of the suspects in the latest round were in the medical proffesion so how convinced the police would be by a letter is hard to say.
Anyway, she told me to pass on her experience to people so they are forewarned so to speak.
ps she said the police were very nice just very suspicous and did not understand