Well, of course you can go wrong. In the past the successful prefabs were always little individual homes of the kind that rolled off the production lines after the Second World War, were much loved by their occupants, are now sometimes listed buildings, and whose spiritual descendants are the well-equipped tin cabins you find in caravan parks and campsites across Europe. The ones that went wrong were the "system-built" ones - the big, tall or slab-like council estates made out of concrete panels. Plenty of those didn't go wrong, but those that did, mostly in the 1970s, gave the genre a bad name and they are still being knocked down today. They didn't look too good, either: the best tower blocks were always the bespoke ones, never the system-built ones.

But because these things come around again, and because people do learn a bit, sometimes, from history, we have Raines Court. This is quite a bit different. It's not made out of concrete panels, and it's not a council estate. In fact, the way it is made is more like taking a lot of those post-war prefab bungalows, stacking them up to make a big (but not tall) block, and then adding a grand communal entrance, access decks to get to the front doors on each level, some big balconies and suchlike. It arrives on trucks and clips together. It's giant Lego, and as everyone knows, you can make interesting things out of Lego.