I realise it's after 7 and it's a perfectly acceptable time to be awake, but I have a 3 week old so I've seen a few hours of the night!
Love the idea of the one on one holiday stay and will tuck that away for when I'm eventually dealing with school age DD's :)
Also, go! Go to London!! You don't need to know anyone, plus most are very friendly. The best bit of traveling alone is only having yourself to please!