UK internal air travel for non-British national without a passport

Firstly a bit of background. I'm a British national, my wife is Taiwanese. We currently have a pending Indefinite Leave to Remain (ILR) application, so as a result the Home Office currently have both of our passports and her biometric permit. Her previous leave expired in January but as we submitted the ILR application in December her current leave to remain is valid until a decision is made by the Home Office.

We would like to visit Scotland on holiday within the next couple of months. We have several friends in Glasgow and I've never travelled that far north in the UK before. We live on the south coast, so our options are:

A 10 hour drive (in ideal conditions)
A 9 hour train journey
A 1 hour flight

We live within reasonable travel distance of Southampton airport, so the flight option sounds best for us.

I'm of the understanding that for an internal UK flight we do not need passports, only a valid form of ID such as a driver's license. I have a full license and my wife has a provisional license, so we can travel on those, however given my wife's pending ILR visa application I'm nervous about using airports for fear of any misunderstandings about her current situation by border staff.

I know that this would not be an issue at all if we were to travel by land, so for those who have travelled within the UK, how does the landing and arrivals process for internal UK flights differ from international flights? Are my worries justified or misplaced?

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Can you fly UK to UK without a passport?

You must have a valid passport to enter the UK. It should be valid for the whole of your stay. You may also need a visa, depending on which country you're from.

Can I fly national without a passport?

As of February 2021, there are no states that require passports from U.S. citizens to fly domestically. Your airline or the TSA should never ask you to present a valid passport. Of course, you can always carry it with you for additional identification in case you lose your other forms of ID.

Do you have to go through immigration for domestic flights UK?

If you're coming in on a domestic flight then you don't need to worry about immigration as you'll be able to head straight through to baggage reclaim. Flying internationally? You'll need to come through UK border control.

Where can you fly without a passport from UK?

Anyone in the UK can enter another country within the Common Travel Area, which consists of England, Wales, Scotland and Northern Ireland, plus the Crown Dependencies (Bailiwick of Jersey, Bailiwick of Guernsey and the Isle of Man) and Ireland, without the requirement to carry a passport.

British Airways refused travel without an expired passport

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Ethan Wilkinson, Olga Lioncat, Gotta Be Worth It, Harrison Haines