best time is June, for one reason
best time for London is June, and for one reason alone......
it's called "Trooping the Colour", and it's a spectacle of a parade which happens on three consecutive Saturdays....it's a celebration of the Queen's birthday, so they have a parade , with the first two Saturdays a "trial run" in full dress (for practice, but in full dress and everything), only the Queen's carriage is empty....the third and final Saturday has the Queen riding in her royal carriage.
See :
http://www.trooping-the-colour.co.uk/.
the whole thing is replete with all the royal horses, the royal cannons, guns, musicians, several branches of the guards and soldiers, all dressed in full RED and Black uniforms with various hats, including the tall, fuzzy ones. I've never seen such a spectacle anywhere, and we happened upon it by accident......it proceeds out of Buckingham Palace, travels down the "Mall" (the long road which approaches the palace), and into the courtyard where the actual celebration and presentation takes place in front of the Queen. Dignitaries watch there from the bleachers alongside the Queen, which are set up according to each family's military and social standing, etc.
The part to see, tho, is the parade down the Mall, and you will be able to get within feet of the whole thing......you can almost "reach out and touch" each horse and soldier, and it puts the "changing of the guard" to SHAME. The changing of the Guard involves only a few soldiers, whereas the Trooping the Colour involves HUNDREDS...absolutely amazing, and it's all totally FREE. just get there and get a good spot anywhere along the route about an hour prior, but it's not at all hard to get a great spot.......it's a mile of both sides of the road, so there's lots of room, and the kids have a ball watching the gorgeous horses!!! Those animals are amazing!!! White stallions, gray stallions, black stallions.....all perfect!
Google it and take a look. you'll never regret it, and it's seldom mentioned....we've done it twice, and it made our trips! Also, June is quite pleasant, with wonderful temps, and the flowers are also blooming all over the city........couldn't be a better time. And it's not COLD or HOT. good luck, marty (jme)