I took my children to London over the New Year and for the first time ever, was in Central London with the crowd of tens of thousands. I am ashamed to say as a Londoner that I had never done this before but this year made the effort to watch the live fireworks show over the river around the London Eye and Big Ben.
Here is someone's video posted on YouTube:
If you ever have a chance, go to London over New Year. You can arrange all your travel on EuroTravel.