Working a few years back in London as a Project Manager for a concrete subcontractor, I spent a lot of time writing letters to Main Contractors either justifying delays so we weren't charged for them, or claiming reimbursement for delays caused by others. This sort of thing:
Dear Sir, I wish to advise that with regard to the above contract we are in delay on Item 17 due to obstruction by other trades/unavailability of crane time/weather events as per clause XYZ.Why am I telling you this? Because it's already one fifth of the way through March, yet it only seems like yesterday we were enjoying Christmas. And, fact is, I always wanted to send this sort of letter to a Main Contractor:
This will accordingly have a knock-on effect on Items 18, 21 and 25. Please find attached Daywork Sheets to reflect this delay. Yours etc.
Dear Sir, I wish to advise that with regard to the above contract we are in delay due to the fact this year has just gone so damn quickly...