I'm already booked in at the Alamo - I'm the one with the single. They have my prepay credit card number, but it's only held in case of cancellation, so I didn't bother to tell them that it never has any money on it - what they don't know won't hurt them

After all, I have no intention of cancelling and I'll pay cash when I get there.
I showed Mum the ticket, it seemed the easiest way.
I'd told her I would be booking for Glasgow when we got back from Cardiff, and we've been back nearly two weeks now. She didn't seem upset - she implied that she had decided not to come - maybe she really did or maybe she just thinks she did, we certainly didn't discuss it. Anyway I told her about meeting you two and she was genuinely excited for me. I dangled the idea that of course she could still choose to come at a later date, but I'm pretty sure she won't. She said, "Of course I would have come if it had been Edinburgh. But at least I know you won't be on your own now."
All seems to have worked out amicably. Good - I really didn't want to hurt her feelings... but I really wasn't keen on a repeat! Anyway, I can't imagine she'll want to do the overnight coach, and that's certainly the cheapest option for me. £25 return!