If you want to raise issues directly with Skanska, this is the email address to use:marc.zahra@skanska.co.uk
Don't expect anything to happen with any great speed - the new light outside our house was installed in February and still isn't working, despite me reporting it several times. It will, apparently, be commissioned sometime in the next week.
Skanska seem to have the most bizarre, if not byzantine, work practices I have ever seen.