>> He's quitting as Britain's Ambassador to the European Union, just months before the UK is due to kickoff divorce from the block. And now a letter to staff published by the BBC shows Ivan Rogers speaking his mind on Brexit, saying London lacks experienced negotiators to carry it off.
And urging the team on the ground in Brussels to challenge muddled thinking. Reuters political correspondent Kylie MacLellan explains the significance of the resignation.>> It highlights the tensions between the government and a largely pro-EU civil service tasked with implementing Brexit. In his resignation letter, Ivan Rogers said that he wasn't aware what the government's negotiating objectives were for Brexit.
And he would have been one of the key members of that team. So for him to not even have known shows possibly how little preparation has been done. Or how small a group of people have been involved in it.>> Rogers has clashed with London over its approach to Europe.
In October, he warned that a trade deal with the EU might not be done until the early to mid 2020s. Rogers was due to leave his post this October. He'll now step down in a matter of weeks.>> Brexiteers have been calling for someone who supported Brexit to replace Ivan Rogers.
That could be quite hard to find in the civil service. It doesn't have to be a civil servant. Late last year, former prime minister David Cameron's former chief of staff was appointed the ambassador to France. So they could cast the net a bit wider.>> Rogers claimed he was stepping down so a successor could be appointed before formal Brexit talks start in March.
Delighting those against British membership, who claimed he was a Europhile. But there's no denying that Theresa May now faces what are likely to be amongst the complicated negotiations in post-World War II European history, without one of Britain's most accomplished EU experts