The plan is to have a factory shutdown from December 24th to January 1st inclusive, running under the same arrangements as the long-established 14-day summer break, during which teams can only maintain a skeleton staff.

The key items prohibited in the summer shutdown are wind tunnel running, CFD operation, production of parts, sub-assembly of parts and assembly of cars, and "any work activity by any employee, consultant or sub-contractor engaged in design, development or production".

Read Also: FIA approves Formula 1 2019 calendar and new rules

The idea, which is understood to have originated at the last meeting of the Technical Working Group, was discussed further by team managers at a meeting of the Sporting Working Group in Interlagos on Thursday.

The matter is now likely to be referred to the Strategy Group.

At this stage any decision for December 2019 will have to be agreed unanimously, because changes would have to be incorporated in the next year's rules, even though the break would actually impact development for the 2020 season.

There could yet be resistance from teams, all of whom routinely work through the winter period – with some pointing out that engineers from countries like Japan even work on Christmas day.