Shovelling coal into the feed hoppers of the automatic stokers at Claymills pumping station. The blocks on the floor are made from compressed rapeseed waste and are being trialled as an alternative to very expensive coal. Clearly these are unsuitable for the stokers and therefore have to be hand fired. They burn very hot but do not have enough surface area to volume to raise steam as well as coal. If they could be broken down to pieces the same size as the coal used, then maybe they would be a worthwhile substitute.