How HS2 waste clay could be conjured into concrete to cut emissions

Engineers want to set up giant oven at HS2 boring sites to create calcined clay mix for use in foundations and platforms

The recent announcement that HS2 may still extend to Euston station instead of terminating in the suburbs could be good news for a group of scientific alchemists planning to conjure concrete from London clay.

The boring for HS2 will produce more than a million tonnes of waste overall, and that clay will need to be carted away on the surface.