Hello Mr Haig-Thomas,
It would usually take 18-24 man days for a hangar of 12.4-12.8m.
When your installer contacted me to highlight the issues he was having, I responded by the next day with the information he needed and asked for his telephone number so that one of the engineering team could call him to discuss, but I did not receive a reply.
I'm sorry you feel you were not given better service and have taken your comments on board, as any feedback is valuable to us and we do use it to make improvements.
If you would like to discuss this further I am more than happy to do so over the phone. My direct dial will be on the bottom of each email I have sent you.
Kind Regards,
Beth