With the Government poised to fire the starting gun for negotiations on Brexit, the BBC's Political Editor Laura Kuenssberg investigates what is likely to be the biggest challenge we have faced since the Second World War. Will doing a Brexit deal be an impossibly complex and all-consuming process which will bog down the whole of Whitehall for years? Or could a quick and clean break be much easier than we think? Talking to key players on all sides, Laura Kuenssberg maps out the key issues facing Britain and Europe in the coming years, the political minefield Theresa May's government needs to navigate - and why Brexit matters to us all.