Ms Davidson and Ms Wilson, an environmental charity worker from Wexford in Ireland, have moved in the same circles for years but their relationship only began three years ago.

They got engaged in Paris last year when the Tory leader proposed and were due to marry in October. However, their nuptials were cancelled after they were faced with a five-figure veterinary bill for their cocker spaniel Wilson – who was with them at the polling booth on Thursday – after it was hit by a car.

Ms Davidson has revealed in interviews that the pair plan to start a family.

Ms Davidson said she had been assured by Mrs May that gay rights would not be undermined by any arrangement with the DUP.

"I was fairly straightforward with her and I told her that there were a number of things that count to me more than party,” she told BBC Reporting Scotland