We got a really good response from the builder about our concerns about delays with getting the roof on. The owner got involved and sacked the original roof sub contractor and appointed a new one.
Due to lead time on delivering materials, this will not result in an immediate start on site, but it was decisive response, which is pleasing. Hopefully, gutters and flashing will start late this week. They are also upgrading the roof lining from sarking to an Anticon blanket at no extra cost. This was a pleasant surprise.