In reply to Blue Straggler:
Not Tesco but Morrisons.
I found a DVD copy of 'Amazon Women on the Moon' for £2.50, in amongst all the random cheap DVDs of various quality (from 'Anacondas: Search for the Blood Orchid", through "Vertical Limit", to "Your Friends and Neighbors" and "Igby Goes Down" - usual suspects - but Amazon Women on the Moon has hitherto been quite tricky to track down, so that was a good result for me)
Then when at the checkout, nice lady asked me if I was over 21, when my wine bottle rolled up. I am considerably older than 21. I said yes, and that was good enough for her. Then she asked how old I actually was. Odd. Especially as the same thing happened in Morrisons last December.
Actually I had to produce ID when buying one can of beer at an off-licence last night, too. Charmed!