The FCO has advised against all non-essential travel to Spain's Balearic Islands and Canary Islands.
The Foreign Office had said it was ok for Brits to visit the islands but not mainland Spain.
However, this evening they updated their advice warning Brits not to travel there.
A Foreign Office spokesperson said: “We have considered the overall situation for British nationals travelling to and from the Balearic and Canary Islands, including the impact of the requirement to self-isolate on return to the UK, and concluded that we should advise British nationals against all non-essential travel to the whole of Spain.”
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They have made the decision based on the current assessment of COVID-19 risks in the country.
The FCO website says: "This advice is based on evidence of increases in cases of COVID-19 in several regions, but particularly in Aragon, Navarra and Catalonia (which include the cities of Zaragoza, Pamplona and Barcelona).
The FCO is not advising those already travelling in Spain to leave at this time.
It adds: "Travellers should follow the advice of the local authorities on how best to protect themselves and others, including any measures that they bring in to control the virus."
The latest announcement comes hours after airlines TUI and Jet2 said they would continue to fly to the Balearics and Canaries.
And Transport Secretary Grant Shapps flew back from Spain to deal with the quarantine crisis while he self-isolates.
It's the latest blow for holidaymakers after the UK government took Spain off the 'air bridge' list
Some 600,000 already there must quarantine on their return for 14 days.
Others with breaks booked to Spain and nations at risk of being blacklisted may have to cancel.
Spain's government insists the country is "safe for tourism" and was confident of securing a new 'air bridge' with the UK for its islands.
But this evening those hopes were shattered.
Spanish Foreign Minister Arancha Gonzalez Laya said: “Like other European countries Spain is suffering new coronavirus outbreaks. That’s not unusual.
“The most important thing here is that Spain is making a great effort to control these outbreaks.”
Saying the three most important outbreaks in Spain at the moment were in the north-east - in Zaragoza, Lleida and Barcelona - she added: “All three outbreaks are under control.
“The autonomous communities are applying early detection protocols agreed with the Spanish government.
“Moreover the Spanish government continues to work with European governments to explain all the measures that are being taken to promote a message of calm and confidence."
But Spain is not the only country suffering a spike in infection rates.
France and Germany are among countries seeing a jump in cases, raising concerns that they could also be struck off the UK’s safe list.
Foreign Secretary Dominic Raab has said the government "couldn't give a guarantee" that other countries wouldn't be taken off the 'safe' list.
In an interview with Sky's Sophie Ridge Mr Raab said: “As we found with Spain we can’t give a guarantee.
"All we can say is we’ve got this joint bio-security centre - you can see we monitor the risk in real-time.
"We take decisive, swift action and so there is an element of uncertainty this summer to people who go abroad and that's why our advice is to follow the Foreign Office travel advice which will also link in with the quarantine principle, look very carefully at doing that."
The Government refused to apologise for its sudden decision to scrap the “air bridge” to Spain, despite criticism from passengers and travel firms.
Holidaymakers currently in Spain blindsided by the move have spoken of their 'frustration' and 'confusion' as they learned of the sudden decision.
One factory worker learnt the news as he was packing his suitcase for a trip to Alicante tomorrow, as Brits' summer holiday plans resurrected after vacations were halted by months in lockdown are in tatters once again.
Brit tourists already in Spain say they face problems at work now they must return to unexpected 14 days' isolation.
