For context, yesterday's drama is explained here: https://community.autism.org.uk/f/miscellaneous-and-chat/34878/not-quite-the-afternoon-i-d-had-in-mind
Earlier this evening I thought I would try to do something nice for my mother by getting the ball rolling regarding a replacement concessionary travel pass. As the online form I was completing required at least one phone number, I messaged my mother to make her aware of what I was doing, and to ask if she would prefer me to state her landline number or mobile number on the form. She replied that she needed to sleep on it. I couldn't understand why. She had lost her concessionary travel bus pass, so surely it made sense to get a replacement sorted out as soon as possible so that it would be one thing less for her to worry about.
I decide to go ahead and state both telephone numbers, which I suppose was somewhat naughty of me. The thing is, I know that if my mother was left to her own devices, nothing would get done. My mother then phoned me to ask what I would do if I was in her situation, and which number I would give.
Me: It's okay. I have given both numbers. If there is an issue with the application, I will be notified by e-mail.
Mother: But they will require a photo, which you don't have.
Me: No they won't, as they can use the same photo that was on your original travel pass.
Mother: How? Which of my e-mail addresses do you think I should give?
Me: You do not need to worry about that. I have made the application for a replacement, and paid the fee for the replacement. It has been confirmed on my screen that now it just needs to be processed at their end.
Well, I had no option other than to see the funny side when I stood up to replace my phone on the handset, and spotted something on the floor, lodged under the wheel of my office chair.
After the drama of yesterday and the somewhat frustrating telephone conversation, that I had just been having with my mother, her *lost* travel pass had been here the whole time, hidden under the wheel of my chair... A chair that I had invited her to sit down on yesterday. I couldn't bring myself to tell my mother about my discovery, otherwise, she would likely have gotten upset that I had just wasted £7.50 on a replacement travel pass for her.
If my dad was still alive, I imagine he would be crying with laughter... in addition to rolling his eyes and feeling exasperated with my mother. 
I have now decided upon the perfect Christmas stocking filler for my mother... A travel pass wallet that is attached to a lanyard, which she can wear around her neck.