The British government on Tuesday defended its decision to quarantine all travellers arriving from Spain after it was openly criticised by the Spanish prime minister.

Pedro Sanchez called the move to impose a 14-day quarantine on all those entering Britain from Spain -- abruptly introduced by London on Saturday night -- as "unbalanced" and insisted parts of his country were safer than the UK.

Britain imposed the measure, which has also been heavily criticised within the country, following a surge of cases in Spain in recent days.

"That is to say, in epidemiological terms, it might even be safer at these destinations than in the United Kingdom," Sanchez told the Telecinco channel in an interview late Monday.

He added that Madrid was in talks with London "to try to convince them to reconsider the measure, which in our opinion is unbalanced".

But Britain immediately rejected the Spanish leader's claims and said it would keep the latest quarantine rules in place.

Simon Clarke, local government minister, said there had been a 75-percent increase in reported cases at the end of last week.

"We respectfully disagree with the Spanish government's position on this," he told the BBC on Tuesday.

"We obviously continue to work closely with them and we wish them every success in managing this outbreak, but we've seen a very sharp increase in cases in Spain."

He added there were no plans to change the policy.

- 'Badly handled' -

Britain's main opposition Labour party said Boris Johnson's government had "badly handled" the decision.

It called for help for those British tourists hurriedly returning to the UK over fears that the new rules could impact on their jobs.

London had initially said people could still travel to the Canaries and Balearics, but later extended the quarantine to these island groups.

The move is potentially perilous for the Spanish tourist industry, which received 18 million visitors from the UK last year, the largest of any national group.

Spain's tourist industry accounts for 12 percent of gross domestic product and 13 percent of employment.

Norway has imposed similar conditions to the UK and the French Prime Minister Jean Castex has "strongly recommended" that people avoid going to northeastern Spain, the worst-hit area.

Britain and Spain are among the European countries worst hit by the pandemic.

Official figures show there have been almost 46,000 deaths and 300,000 people infected in the UK, though the actual numbers may be far higher.

In Spain, more than 28,400 lives have been lost and more than 272,000 people infected. AFP