The FTSE 100 index was up 0.1 percent while the country's borrowing costs eased on the news, as the yield on 30-year government bonds, known as gilts, fell to 3.94 percent."After a flurry of activity we are seeing retracement of these initial moves as markets realise that there's still huge uncertainty about whether the Tory party can survive in power."The government had teetered on the brink of collapse after the resignation of home secretary Suella Braverman Wednesday."Although the resignation of Liz Truss as Prime Minister leaves the UK without a leader when it faces huge economic, fiscal and financial market challenges, the markets appear to be relieved," said Paul Dales, chief UK economist at Capital economics.Oil extended Wednesday's rally that came in reaction to a drop in US petroleum stockpiles, and despite President Joe Biden's decision to release 15 million barrels from US strategic reserves."