OK, here are the results of yesterday's informal predictions:
A number of people DID turn up for this morning's first train, not realising that a replacement bus had gone a few minutes before.
1 - 0
There were issues with rolling stock, as I thought there would be. I know of at least one early train that was cancelled.
2 - 0
My 'Fast' train (a) turned up on time and (b) still had the extra carriage glued to the back. It also had plenty of seats spare. The train did stop at a couple of extra stations en-route, presumably because of the aforementioned cancellation. Fifteen minutes late into Marylebone, but that wasn't really a surprise.
2 - 1
Tonight's train(s) home had loads of spare seats and one was also longer than usual.
Now we just have to hope that the engineering work at Aylesury is completed on time tomorrow night.
Another day beckons...