China is the 'greatest strategic threat,' facing Britain, GCHQ has revealed as it warned cyber security teams were dealing with up to 60 serious incidents every month.

Jeremy Fleming, director of GCHQ, has warned of the threat China poses after offering assurances that intelligence haring with the EU will not change in the event of a No Deal Brexit.

Mr Fleming warned vaccine suppliers and hospitals were being targeted by Chinese hackers looking to capitalise on uncertainty brought about by the Covid-19 pandemic and Brexit.

Yesterday General Sir Patrick Sanders, commander of UK Strategic Command, told The Sun that the threat China posed to the UK was 'chronic'.

Mr Fleming revealed the National Cyber Security Centre is dealing with around 60 serious incidents every month.

He said around 200 incidents over the last nine months have been related to coronavirus.

Mr Fleming told The Sun: 'We have seen serious criminals and states trying to take advantage of this situation. They have targeted the vaccine's production and supply chains, government services and healthcare.

He went on to warn that members of the public were being tricked into handing over money in scams that posed as offering Covid-19 testing and treatment.

Warnings over China came as Mr Fleming warned that an agreement still needed to be reached with the EU around data adequacy, a status granted by the European Commission allowing a free flow of data between European Economic Area (EEA) countries and those outside it.

However, Mr Fleming said the UK is operating 'even more closely' with European counterparts now than it was at the point of the 2016 referendum.

The GCHQ chief was speaking at a Chatham House event alongside General Sir Patrick Sanders, Commander Strategic Command, about the UK's recently revealed National Cyber Force, a joint MI6 and military effort to combat the growing threat of hostile states, terrorists and criminals online.

Sir Patrick said the relationship with key EU allies is 'strong enough to withstand any of the strain and tension that may arise' after December 31 in terms of defence and security.

'It's no secret that the UK is one of the two leading powers in defence and security of Europe and that regardless of the outcome on the 1st of January that won't change and our relationships with our European partners and a few in particular is strong enough to withstand any of the strain and tension that may arise as a result of that,' he explained.

'When it comes to all the defence and security aspects that I'm involved with, those links will not change and if anything they will be as strong, and of course Nato is the critical but not the only vehicle.'

Mr Fleming said: 'It is the case that today we are operating even more closely with our European colleagues than we were at the point of the referendum and we do that because there's great national self-interest in close cooperation and I fully expect that to be the case the 1st of January, deal or no deal.

'We need to reach an agreement with the EU around data adequacy, it is the UK's position that our arrangements – obviously because they have been developed whilst we were in the European Union – are adequate in so far as the EU is concerned going forward and we just need to nail that down, but I think that can be a relatively straightforward thing.'