Calpol...
I believe some people have reds living right nearby but don't know it as they don't come down to the ground as much as greys and are certainly more timid and smaller.
They are a bit pickier about habitat and diet too, I believe, so in a more built up area there certainly wouldn't be as many reds as you could have a short walk away in an area with more trees and suitable food.
As I understand it, if an area with reds has greys in close proximity, it's a matter of time until the reds decline and disappear, especially if the greys are carrying the pox.
devonwoody...
This is not a matter of evolution. This is not a matter of the strongest survive.
This is a matter of one complete and utter moron introducing a species into an ecosystem in which it had no part in. It is not just reds vs greys... it is an invasive species which does huge damage to the native reds (which should never have had to compete with it) to bird populations (raiding nests to eat fledglings and eggs) and to the native fauna.
The nearest thing there is to "part of evolution" is the blacks which are taking on the greys in the south... not that that has anything to do with evolution at all, but that's a natural change of some sort which leads to a variety which does better in this environment. Natural as opposed to man-made. (And no, that is not the same as evolution.)
Attempting to undo the mistake of releasing greys into the wild over here is attempting to undo a monumental ****-up which has had a much bigger impact on the stability of the British ecosystem than most people can begin to imagine.
The Romans coming here was (if we're trying to drag it all down to some loose argument about evolution) not one species wiping out another. It was one group of the SAME species trying to oppress another. If the greys from London march up to Birmingham and then on to Manchester, wage war against the local greys and levy a tax on all their acorns we'll have a parallel. As it stands there's just no comparison to make. If they use those taxes to build military roads, build forts and eventually begin to make raids into the "barbarian" territories in the north (funny that both "barbarian" elements in this had red hair - haha) before over stretching, getting into political turmoil and then collapsing back leading to a rejection of all squirrel culture from London and a return by the Northern and Midlands squirrels into some kind of squirrel-dark-ages we'll really have something to talk about.
As it stands the greys problem is a glaring example of how man is screwing up the planet and fortunately is something we can quite easily fix. Unfortunately the "animal rights" brigade, the RSPCA and so on are somewhat opposed to the completely humane and massively effective direct approach in favour of some daft "softly softly" approach which anthropomorphises the greys and just makes the problem even worse for the few pockets of reds left south of the border and things more precarious for those in the North.