The deal to create MainStreet Pictures follows the news that the commissioning pair will leave the broadcaster in June after a seven year spell.
Boom Pictures will umbrella the new company and has taken an unspecified stake – thought likely to be a majority shareholding of around 51%.
Mackie and Haynes will join in July and look to develop a range of dramas including crime thrillers and period pieces, as well as contemporary dramas. They are expected to search for a number of development executives to bring into the company.
The move is a coup for former BBC 1 controller Heggessey, who set up Boom with Boomerang Plus founder Huw Eurig Davies in July 2012, and who worked with Mackie and Haynes at the corporation.
Heggessey told Broadcast that Mackie and Haynes were “two of the best drama executives in the country” and that the timing of the move was ideal, coming just after the government is set to introduce tax breaks for British drama.
MainStreet is the second umbrella production deal for Boom, which backed Graham Linehan’s comedy company Delightful Industries last year. The emerging umbrella model sees producers sell a stake in their start-up company in return for organisational support.
“There’s now a generation of people that want to set up on their own but it’s difficult to do so. They need the back up and we provide the creative and financial support,” Heggessey said.
See this week’s print edition for more on Boom’s strategy and the MainStreet deal.