This agreement is not the equivalent of a free trade agreement. The UK stopped following European Union rules at 23:00 GMT, as replacement arrangements for travel, trade, immigration and security co-operation came into force.
Despite a raft of new rules for trading with the EU, Brexit is still a boon for exporters, Johnson said. "We tried very hard to make progress on various things", Johnson said in his first public comment after a conversation Wednesday in Brussels with the President of the European Commission, Ursula von der Leyen.
"There is some bureaucracy and we're trying to remove it", Johnson said when asked about the new red tape that took effect on January 1.
The 1,246-page trade agreement, signed off on December 24, created a free trade area with zero tariffs or quotas.
Under the new arrangements, freedom of movement rights end and, while United Kingdom citizens can still travel for work or pleasure, there are different rules.
French nationality would give the elder Johnson the automatic rights that other Britons have now lost, including being able to travel and live freely in all of the 27 European Union countries.
Schools will not reopen until January 18
The first starter packs of up to 1,000 test kits are scheduled to arrive at all secondary schools and colleges on January 4. "We have been adamant that educating children has been an absolute priority and keeping schools open has been paramount".
Hauliers face new rules and lorry drivers heading for the Continent must have a Kent Access Permit before entering the county in an effort to curb tailbacks on cross-Channel routes.
Big Ben chimed at 11pm, when the Prime Minister is understood to have marked the occasion with his family in Downing Street.
Sir Bill Cash said it was a "victory for democracy and sovereignty" while Sir John Redwood said he looked forward to using the "new freedoms and opportunities now open to global Britain".
United kingdom travellers are also confronted with a raft of new fees and charges, including increased journey insurance policy premiums to deal with the outgoing European Health Insurance Card (EHIC) plan, larger sized mobile phone expenses (even though some networks have pledged to keep on giving no cost roaming for the time now being), and far more charges and difficulties for those travelling with animals. "It's a shame the pubs aren't open".
Scottish First Minister Nicola Sturgeon, whose ambition it is to take an independent Scotland back into the European Union, tweeted: "Scotland will be back soon, Europe. Keep the light on".