Reuters sources with this one.
And the reaction in the pound? Zilcho!
Showing that the Art50 date doesn't matter in the grand scheme of things. It was always coming at the latest, the end of March.
When it does happen there may be a confirmation move in the quid but all the UK is doing is putting a stamp on a piece of paper officially telling Europe we're coming out.
Update: Now confirmed by May's office.
UK's permanent EU representative informed Donald Tusk's office of May's intention to trigger art50 29th March
There are no plans for an early general election