The first week of the new-year is traditionally a time when we all resolve to lose 10 pounds, go running every day and abstain from booze, fags and all other vices until daffodils appear. The second week of January is when we decide that we're all going to die anyway, so we might as well have some fun in the time we have left.
A spring is certainly present in a lot of Londoners steps right now. They're pleased to hear that they can party all night and take multiple methods of transport home rather than dashing for the last tube or trying to find where that night bus goes from. However, there are so many issues with this idea.