I wrote a long photography blog post about it, so you can read more there, but one of my favourite parts of the day was when a lovely lady was cheerfully handing out samples of Twinings' Royal Wedding Commemorative Blend tea.
It is absolutely incredible. I might go so far as to say it's one of my favourite teas of all time, and I think I honestly mean that based on the qualities of the tea alone, and not just the general euphoria of being in London for the beautiful event. Before I even looked at the type of tea it was, I described it to someone as 'tasting like a wedding in a cup' - it was light (like white and ivory and cream dresses), with a rose petal flavour (like the flowers that are held and the rose petals that are strewn and the bouquet that is tossed), and you can drink it right down to the bottom of the cup whilst enjoying every sip (like the joy of a wedding day that is beautiful from beginning to end).
At the start it is very light, and they recommend you don't oversteep it, but I left the teabag in and enjoyed a deeper, richer taste later on. Like the difference between having a wee tear fall during the ceremony, and then a falling-over-yourself-laughing spree with some of the groomsmen later. (Groomsmen, and best men, are always hilarious. I'm a wedding photographer, and I can tell you, that's their job, and they do it incredibly well.) Both are such an important part of the day, but one is much different than the other.
Walk length: 1.5 hours