"UK didn't show the willingness to break the deadlock on level playing field and fisheries".
The UK has refused to commit to a level playing field for trade and compromise on access for European fisheries, Brussel's point man for talks on a deal, Michel Barnier, said on Thursday after the latest round was concluded.
"We get on well and I like to think we are both professional negotiators, we both have a position to deliver and we get on with doing that".
With the Brexit transition period - which has effectively left the UK-EU trading and travel arrangements unchanged despite the UK leaving - coming to an end on 31 December 2020, the latest round of negotiations was seen as key for a possible agreement.
"Looking forward, there are large areas of convergence in numerous areas on which we are negotiating and ample precedents and texts on which we can base our work", said Mr Frost. London wants a deal similar to the one the European Union has with Canada, but Brussels insists Britain's close proximity to the continent needs to be taken into account.
"We have made some positive progress on some of these issues but challenges remain, particularly in the area of subsidy control".
"Looking forward, there are large areas of convergence in numerous areas on which we are negotiating and ample precedents and texts on which we can base our work".
The Institute for Federal government (IfG) claimed past 7 days that a few out of five corporations experienced not even started to put together for the end of the transition period amid ongoing uncertainty about the long run partnership with the EU.
With less than six months to go until the end of the Brexit transition period, the United Kingdom must "continue preparing for all possible scenarios" for once that deadline passes, he warned in a statement.
"The prime minister also stated three red lines".
"The progress is genuine", one senior United Kingdom government official involved in the talks told reporters.
Despite the cut-throat nature of the talks between both sides, Mr Frost said he enjoys a "good relationship" with his European Union opposite number.
The next round of talks resume in London from August 17.
'Number two; the right to determine future United Kingdom laws without constraints.
"We also recognise that, under the future agreement, there may be change to the benefit of United Kingdom fishermen".
But if not, then October is the latest point for a deal to be reached, Mr Barnier warned.
"We have tried to understand how these three red lines can be squared with our commitment to a comprehensive new partnership as set out in the Political Deceleration signed by prime minister Johnson on 17 of October past year".
Mr Barnier said: "On important areas such as climate, environment, labour or social law, the United Kingdom refuses effective means to avoid undercutting by lowering standards".
"However, over the past few weeks, the United Kingdom has not shown the same level of readiness to find solutions".