An Opinium poll also found that 42% of people who voted Leave in 2016 had a negative view of how it had turned out.
Industry chiefs and experts tell i the introduction of customs controls could also affect small businesses, some of which could be forced to pay tariffs.
Figures reveal impact of Brexit and pandemic, with £2.7bn fall blamed largely on 24% drop in sales to bloc
Sales to Germany, Spain and Italy all dropped by more than a third in the past year.
UK food and drink exports to EU plummet 02/09/2021
Food and drink exports from the UK have plummeted due to a sharp drop in trade with the EU after Brexit, according to fresh research published today.
The UK’s trade agreement with Australia led to British farmers and associations voicing concerns about unfair competition and a lowering of food standards.
Export values of chocolate from the UK to the EU have fallen significantly from 2019 to 2021, with figures down 36.9%
Sales to Ireland, UK’s biggest market, plunge more than two-thirds.
The figures show Brexit-related problems are structural, not "teething problems".
UK food and drink exports to the European Union almost halved in the first three months of the year, compared with the same period in 2020.
The UK exported more food and drink to outside the EU than into it in the first few months after Brexit as exports to the bloc nosedived.
Industry body says analysis of HMRC data shows structural rather than teething problems with Brexit.
First quarter UK exports fell from £5.1bn in 2020 to £3.7bn in 2021, mainly due to new trade barriers with the EU.
Dairy shipments collapse by as much as 96 per cent. Experts say extra red tape and delays are to blame.
British companies trading with Europe will have to absorb a post-Brexit bureaucracy burden and fill in an extra 215m customs declarations at a cost of about £7bn a year, according to government officials.