So .... what you're saying is, when my friend's daughter moves to Scotland in couple of months, she'll have to either have a passport, which she doesn't currently hold (£77.50), or exchange her paper driving licence for a photo, which she has no need to do (£20) in order just to fly up to visit her daughter? But she can get a flight for only £50.
Question .... why don't 'they' issue all those of pensionable age with a free photo ID card?
A lot is down to the discretion of the airlines, but most will only accept a photo driving licence or a passport, because these are the only IDs issued by the government. It's best to check with the airlines before you travel, and if you do need a passport or a new driving licence, it will take at least 10 days to get either by post.
I had a lot of problems renewing my passport, because the wretched photo machine in my local supermarket kept telling me that the photo it had just taken 'was not suitable for a passport application', but it didn't tell me why ! In the end, I went to a small post office which did a photo service, where the man took a photo with a Polaroid camera. It turns out that the new regulations say that the photo must show the entire eye, so your eyes must be fully open, but you must not stare - not easy !

You should also not wear glasses for the photo, because the photo flash can reflect in the glasses and obscure the image of the eyes. When I'd filled in the forms and enclosed the photos, I used the Post Office 'Check and Send' service, and I'm glad I did, because I'd filled the forms in with a blue pen, and the authorities only accept black ink !

As for the free ID card idea - well, some would complain about their rights, which would play right into the hands of the government, who do not want to lose all the passport revenue !
