Not really, not at all actually. I'm pointing out that the zombies would be fairly trivial to defend against. Might not have been so clear but my primary aim (if in London) would be to get out of London within a few days, at night... and return to an area much less populated, int he Midlands, where most of the neighbours are fairly intelligent and mostly known to each other.
It is a pretty fair bet though that the neighbourhood in the midlands would already be impacted by that kind of thing by the time you got there - unless they isolated themselves early on with some discipline and then you'd likely not be welcome there.