Ursula von der Leyen, President of the European Commission and Keir Starmer.The UK and EU have agreed a new “reset” deal after a late-night “breakthrough” in crunch negotiations, HuffPost UK has learned.An agreement which will see European fishermen given access to British waters for a further 12 years was finally reached on Sunday evening – sparking claims of “betrayal” by the government’s critics.Keir Starmer will unveil the full details of the deal at a special summit in London later today.The government says an agreement on veterinary and agricultural food rules will remove trade barriers which have been in place as a result of the post-Brexit deal struck by Boris Johnson in 2020, and cut prices in the shops.Closer ties on security and defence co-operation between the UK and Brussels have been agreed as part of the negotiations.One of the key aspects of the agreement is a youth mobility scheme, which will make it easier for 18-to-30-year-olds to travel between the UK and the bloc.British holidaymakers will also be abl