Background information: My husband and I (mid-late thirties) enjoyed a wonderful 6 nights in London, from 26th December - 1st January before heading on to Paris, Berlin, Salzburg & Vienna. We spent many, many hours on the London forum reading other people's posts and advice. This site provided a wealth of information for us... and I still regularly read the forum to “keep in touch”!
We arrived in London with ideas of things we would like to do and see, but did not come with a daily itinerary. Rather, we enjoyed letting each day unfold. Having said that, we had pre-booked theatre tickets, The Tower of London and 2 restaurants (including NYE) before leaving Australia.
After arriving at Heathrow on our Emirates flight, we breezed through immigration, baggage collection and customs. We calculated it had been 32 hours since we’d left our home in the Adelaide Hills (South Australia). Suffice to say, we were so glad to have booked a car service (Exclusive Airports) to take us to the door of our accommodation, The Montague on the Gardens (reviewed separately). (Neither the Heathrow Express or Tube were operating this day, which we knew of before leaving Australia and were able to make alternative arrangements, thanks to advice from the forum.)