Landed back home a few hours ago, and I would just like to thank everyone for their help.
I managed to check out Paddington, Victoria, Waterloo, Marylebone, and King's Cross for a couple hours each.
Travelled around all over the Oyster map with no real plan, all the way out to zones 8 and 9. Gotta admit that the Oyster travelcards are much more inclusive than I previously thought.
Spent some time at Alexandra Palace, where I managed to catch a 717 on what I assume was a test run. No destination, all the lights turned off, wasn't scheduled to stop.
Filmed and rode the 313's on the NCL for the first and, most likely, last time.
Caught both the Night Riviera and the 23:50 Caledonian Sleeper, one time each.
Saw and filmed quite a few diesels, including a few unexpected 66's, though mostly HST's and Chiltern DMU's. Honestly, not disappointed.
I did go to the Isle of Wight, though only for a few hours before darkness fell. But it was worth it.
All in all a pretty good trip, even though I did get soaked from head to toe while at King's Cross earlier today. But I've only got myself to blame. I just had to catch that one Virgin branded 43 departing.