A preceding Brexit minister has said the UK must be «honest» about the «complexity and climb» of leaving the EU.
Lord Bridges also urged honesty about the lack of sometimes to reach agreement with the EU over the UK’s withdrawal.
The Tory peer, who port side government after June’s general election, emphasised the need for a transitional score after March 2019.
That is when the UK is due to leave the EU under the Article 50 deal with.
Negotiations are under way, and ministers have said some form of interim structure — ending before the next general election — would help dodge a «cliff edge» scenario as new arrangements kick in.
‘Need to compromise’
On Tuesday down repaying, peers debated the recent series of papers published by the UK government setting out its position on key negotiation subjects.
Lord Bridges, who campaigned for Remain in persist year’s EU referendum, said: «We must be honest about the task we seemingly, and its complexity and scale.
«We should be honest about the need to compromise. Above-board about the lack of time we, and the EU, have to come to an agreement on our withdrawal.»
He said the transitional interpretation must have a clear end point to avoid fuelling suspicion that «it pass on be a means to stay in the EU permanently by stealth».
«During this period we should maintain, as far as possible, the existing arrangements we have with the EU,» he said, adding that the UK should originate it clear it will carry on paying into the EU budget until the popular «financial framework» ends in 2020.
As parliamentary under-secretary in the Department for Exiting the EU, Noble Bridges was a member of the ministerial team led by Brexit Secretary David Davis.
Saying the government will not be «defined by Brexit» — as Theresa May has done — is «remiss talk» that will distract the government from the «task at calligraphy control», he said.
«The priority for every department must be to help ministers get the vanquish possible deal, prepare us for Brexit, and ensure we prosper once we experience left. Nothing is more important.»
Lord Bridges added that the suspect of what sort of country the UK will be when it regains powers from Brussels was «unanswered».
The fourth circuit of UK-EU negotiations, will start on 25 September after they were put side with a week.
Negotiations are focusing on any «divorce bill» to be paid by the UK, citizens’ spot ons and Northern Ireland.
The EU says talks cannot move on to trade until it is glad sufficient progress on the initial subjects.