Absolutely. In fact, I'm sure all of the Londoner Playgrounders would get to make an appearance in the second half of the film at the very least - some survive, some don't, some are fleeing and others are fighting - and of course everybody gets to kill horses in creative and amazing ways.
I'm already thinking of the possibilities - perhaps you could use the London Eye as a battering ram against them and a means of getting past the horse barricades to get onto the other side of the Thames. It'd be like running on an extremely large Ferris Wheel.
Somebody else could sail the Golden Hind up the river.
Then the Gherkin turns out to be a giant missile.
And Big Ben could ring out loudly enough to make the horses bolt everywhere, giving us the ultimate opportunity to take the leaders of the Revolution down.