london britain offer figure formula much believe owe european union brexit minister david davis say sunday eu demand london spell approach final bill unblock talk movement negotiations unravel 40 years union britain may miss december deadline move talk discussion future trade tie businesses say vital make investment decisions side frustrate lack progress last week eu negotiator michel barnier say britain two weeks spell far would honour obligations break deadlock davis tell sky news eu agree britain would need offer number formula financial deal london accept bloc schedule talk first discussion divorce second future tie every negotiation side try control timetable real deadline course december davis say refer next eu summit take place brussels dec. 14-15 britain hop bloc launch next phase talk british taxpayers would want come along give away billions pound careful take time take time get right answer prime minister theresa may say offer figure financial settlement government know future relationship also want inflame brexit campaigners suggest britain walk away jam dyson billionaire inventor bagless vacuum clean brexit supporter say blame government lack progress problem people negotiate think demand billions billions leave quite outrageous demand negotiate anything outrageous dyson tell bbc would walk away so-called brexit bill difficult hurdle talk far two side must also reach agreement uk border eu member ireland something irish officials say still long way irish prime minister leo varadkar say would threaten use veto brexit talk stage dublin call london go beyond promise hard border ireland northern ireland return britain eu say ready deal message reiterate bloc barnier french weekly journal du dimanche also call britain detail financial commitments would honor theresa may commit pay contributions 2019 2020 well commitments without specify ones barnier tell journal du dimanche european taxpayer pay price decision make ... unite kingdom britain wo n't offer new figure brexit bill unlock talk minister