The material – eight packs of 11mm OSB3 sheathing and three packs of 18mm OSB3 tongue-and-groove flooring – has been used by Invergordon-based off-site construction specialist, Carbon Dynamics, to build 11 two-bedroom NestHouses for the charity Social Bite.

Social Bite is not a conventional charity but one of a new breed of social businesses, genuine trading entities that plough all of their profits into projects designed to benefit society.

Social Bite, which describes itself as "a sandwich shop with a difference", was set up in 2012 by Edinburgh University graduates, Josh Littlejohn MBE and Alice Thompson, to raise money for Scotland's homeless.

It does this partly by giving away 100% of its profits to selected charities, but it also works to provide employment for people and get them off the street. A quarter of Social Bite's employees have struggled with homelessness.