The former special adviser said Boris Johnson showed 'appalled disbelief' when he discovered what leaving the customs union meant.
Communities secretary Robert Jenrick criticised Brussels as a row continues over sausages and chicken nuggets.
Michel Barnier has said Brexit was 'a failure of the EU' and that it needs to learn lessons from the 'social anger' seen in the UK.
More than seven million Oxford/AstraZeneca coronavirus vaccine doses delivered to EU countries have not been used.
'Am I going to sit here and say Brexit is perfect, and that your generation is going to reap the benefits? No, I’m not.'
Scepticism over the effectiveness of the AstraZeneca jab in Germany comes after a muddled communications campaign by the government.
The spat came after the EU’s ambassador in London was not given the same status as ambassadors sent by national governments.
The UK has not offered full diplomatic rights to the EU's ambassador, despite other nations granting the bloc's diplomats all necessary privileges.
Exports of fresh fish and seafood have been hit by delays following the end of the Brexit transition period.
The EU's no-deal planning document depicts a difficult few months for the bloc and the UK if no trade deal is agreed.
A government minister has refused to guarantee the supply of coronavirus vaccines won’t be affected by 'Brexit disruption'.
Opposition MPs have accused Boris Johnson of 'damaging our country' after the PM told the nation to prepare for a no-deal outcome from post-Brexit trade talks.
Labour has claimed Boris Johnson is 'undoing Brexit' as the backlash against his 'illegal' plans to override the EU divorce deal intensified.
YouGov said the survey is evidence of how much the UK has 'alienated' itself during the bitter Brexit fallout.
The EU's chief Brexit negotiator said there had been no progress on fisheries and the so-called 'level playing field'.