David Cameron took three and a half months to reply to Donald Trump's letter
Mr Trump wrote to the then Prime Minister on May 9 to complain about wind turbines which he said blocked the view from his £500million golf resort in Aberdeenshire.
But Mr Cameron waited until August 28 to reply to Mr Trump, who had not launched his political campaign by then, to let him know the turbines were there to stay.
According to the Evening Standard, he wrote: “Dear Donald, Thank you for your letter of 9 May.
“I apologise for the delay in replying.
“Whilst I understand your point of view it would not be appropriate for me to comment on planning and financial support issues which are the domain of the Scottish Government.”
The then Tory leader went on to explain in the letter seen by the Evening Standard, how strongly the UK Government is committed to renewable energy, something Donald Trump has spoken out against in his short time as US President.
He emphasised not once, but twice, how wind power is one of the integral renewable power sources Britain will continue to champion.
Donald Trump complained about wind turbines near his golf course in Scotland
Ending the letter with a polite rebuff, Mr Cameron wrote: “Thank you again for taking the time to write.”
The written exchange happened in 2011 when the billionaire businessman was trumpeting the Obama birther allegations about Barack Obama not being born in the United States.
Two years later, Mr Trump and his legal team attempted to overturn the 11 turbine project, again claiming it would spoil the view at his luxury golf course.
It took Mr Trump until 2016 to admit Mr Obama was born in the state of Hawaii, although he did not apologise.
David Cameron kept Mr Trump at arm's length during his time as PM
Donald Trump Jnr outside an Edinburgh court in 2013 to fight against the wind turbine
In another example of his persistence, Mr Trump picked up his pen to Mr Cameron a year later to moan about wind farms again.
This time Mr Cameron took six weeks to reply to the golf course owner saying: “If you dot your landscape with these horrible, horrible structures you will do tremendous damage.”
Donald Trump's Action Plan
Thu, January 19, 2017
What follows is Donald Trump's action plan to 'Make America Great Again' within the first 100 days of Presidency.
1 of 10
FIRST: Propose a Constitutional Amendment to impose term limits on all members of Congress.
Not one to give up on anything, Mr Trump is believed to have asked former Ukip leader Nigel Farage to “campaign about getting rid of wind farms” during a meeting after he won the US election.
While Mr Cameron kept Mr Trump, who was then just a mere civilian, at arm’s length, Theresa May has chosen to embrace him as president, using the “special relationship” to be the first global leader to meet the new president.
The Standard said Mr Cameron declined to comment about his letters.