score:10
You do not need to worry. Domestic flights do not require passports. But let's see what the authorities say. https://www.caa.co.uk/Passengers/Before-you-fly/Making-a-booking/Travel-documentation/
Some airlines accept photo driving licences and other forms of ID for domestic flights, but many donβt so check your airlines website when you book your flights. If you turn up with the wrong type of ID you will not be able to fly and you are unlikely to get your money back.
Now, you are flying SOU-GLA direct, that means a BE flight. Our next step then is https://www.flybe.com/check-in/id-requirements
Domestic travel - all must be photographic unless otherwise stated
Bingo! Bon voyage.