Andy Burnham has said the UK has “lost more than we gained” since leaving the EU, the prime minister’s latest in a string of comments criticising Brexit.

Outlining his desire to form closer ties with Brussels, Burnham accused the Conservative party of having “burned all our bridges” with the bloc after Brexit and said a new deal he hopes to secure with the EU next week will “get food prices down” and put more money in the pockets of British exporters.

The prime minister is due to meet European leaders at a summit next week and secure agreements that he says could raise GDP by 0.4% – about £17bn – including on food and farming, emissions trading and a youth mobility scheme.…