At first, it is hard to spot. A small hole in the eaves is often all that can be seen. It’s only on closer inspection that a hollow brick can be discerned, slotted neatly into a wall. Inside might be a pair of nesting swifts that have travelled thousands of miles from Africa to the UK.
At Manthorpe Building Products’ factory in Derbyshire, it takes just under a minute to produce a single swift brick that could provide a safe haven for generations of these migratory birds. Granules of recycled plastic are put into an injection moulding machine and, moments later, the separate parts of the brick come out, before a worker snaps them together.
