The intro paragraphs didn’t really hook me.  I thought about suggesting that you just remove them, but no, they’re good - just not hooking good.

The transition to the short train ride and back distracted me.  Somthing like this:

“Dame Judi,” I repeated into the phone as I entered from the platform.  Martin was telling me about all the celebrities that he’d seen.  As an opening line…

would ease it at the beginning, and this:

However, I had not listened to him, and seeing Arabella’s back at the reception desk reminded me of this.  Quickly, I…

would ease it at the end.

Dave.

Thanks Dave, I did feel a little unsure of how it read and I’m pleased that the one area I was concerned about was the one you picked up on.
Thanks
Neil

Very good story, though it was a bit too long, jumping hither and nither, especially at the beginning. I had to read it twice.

But CLEVER as most of your stories are!