To see the potential for a fabulous family home in a dilapidated industrial unit overlooked by a silted-up pond takes a certain sort of vision. Or, in this case, double vision. Because it’s not just one family home, but two, that have been squeezed onto the modestly-sized site of a former corn mill in north Sheffield. The homes have been built by Nik and Jon Daughtry, 48. Nik and Jon are identical twins who are accustomed to doing everything together – including this ambitious building project, which is set to feature on Channel 4’s Grand Designs next week.