The Papers: 'Secret' Brexit bill, and Tory rebels warned

According to The Sunday Times, the outcome of the general election may have cost the country about £20bn. A source, described as a close ally of of Theresa May's, explains that meeting the UK's obligations to the EU had been estimated at up to £30bn. But, it says, the weakening of our negotiating position because the Conservative government lost a majority means the cost will rise.
The Mail on Sunday says the Prime Minister is hoping to keep the details of the likely "divorce bill" a secret until after the Conservative conference. Otherwise, it says, there could a furious backlash from Conservatives opposed to the EU.
The slow pace of the Brexit talks doesn't impress The Sunday Mirror. It calls on the EU to come up with a figure so Brexit Secretary David Davis can make the arguments for reducing it.