My estate agent has just called to let us know that the house we are due to exchange on this week has has a roof leak. The survey didn't pick up any problems with the roof but there have been other areas of concern and I don't trust the present owner to get things fixed properly in a way that would last years. We are pushed for time in sorting this out as the people who are buying are house need to be in by school application cut off date, next Thursday, which apparently means it's too late to get quotes and ask for a price reduction accordingly as all the figures will need changing. So, how do I oversee any repair works and be sure that a proper job is being done?