2 George Street BB5 0HD, and 2 George Street BB5 0ET, both in Accrington, Lancashire, are only 235 metres apart.
Yes, that’s right. These twins are less than a sixth of a mile apart. When I set out to find the closest twins, I thought they might perhaps be around a mile and a half apart, which would itself be quite silly. But 235 metres is definitely in the “What were they thinking?” category.