Don't worry - there's a free number people can call to check you have a license.
In order to use this service the customer first of all has to go onto a website and generate a check digit.
Mrs Donkey needs to hire a car today (long story) so she goes onto the site and puts in the following data;
License Number
Postcode
National Insurance number
Computer says no.
So we try again.
Computer still says "you're entering it wrong, call this number"
Ah but THAT number don't work bank holidays. And the number that is open can't give out that information as it's just a checking service.

So she's now without a drivable car until Tue unless the hire company go against their own rules.......
So i'd advise that you all check your details on this site
https://www.gov.uk/view-driving-licence
....before you NEED it.
Notice that it's been designed by a total retard so you need to put a space in your postcode or it won't work. Note also it won't tell you this. Or format it for you.
