Very (VERY!) nicely done Steve! love it.

Only one thing: the grass & weeds that are growing on the streets are quite saturated green. A bit too green for my taste. I'd imagine it more dry looking, a bit more yellowish. But then again perhaps that's me in dry Southern California. You're in England, where rain is not a rare commodity LOL  so perhaps it does look that green indeed :-)

 

If you need help creating additional shrubbery, I've got a copy of PD Pro Howler waiting for you. Particle brushes can make tufts of grass quickly, for mapping onto billboard polygons. Of course in Carrara you probably use the real Plant object, right?