CAR giant Nissan has confirmed in a letter to workers that the next-generation X-Trail, planned for its Sunderland plant, will instead be made in Japan.

The decision is another huge blow to the UK's car industry which has been warning for years about the impact of Brexit uncertainty on top of other problems such as a slump in diesel sales.

Nissan chairman Gianluca de Ficchy said in the letter that much had changed since the Japanese firm announced plans to build a new Qashqai and X-Trail in the UK in October 2016.

"At that time they were both planned as 'traditional' models, powered by internal combustion engines. X-Trail was already going to be made in Kyushu, but there was a good business case for bringing production to Europe as well.

"Since that time, as you know, the environment for the car industry in Europe has changed dramatically. To meet the changing emissions regulations we've had to invest much more in new powertrains for our future models like X-Trail. At the same time, the volume forecasts for X-Trail in Europe have reduced.

"For those reasons the company has decided to optimise our investments and concentrate production in Kyushu, instead of adding another production site. For the European business, this does not change the fact that X-Trail is - and will continue to be - a crucial model for us.

"Today's announcement will be interpreted by a lot of people as a decision related to Brexit. We have taken this decision for the business reasons I've explained, but clearly the uncertainty around the UK's future relationship with the EU is not helping companies like ours to plan for the future."

The letter continued: "With the UK's departure from the EU on March 29 getting closer every week, we have a taskforce in place, reporting to me, that is considering all of the possible scenarios and the potential impact on the business.

"As a responsible business with 16,000 employees in the region, I want you to know that we are preparing across all functions, and with our supply chain, for anything that might impact our current business model. When the time comes to initiate any of those plans, we will be ready, and we will communicate with full transparency to all of you."

Nissan was still investing heavily in the new Juke model and the next-generation Qashqai, said Mr de Ficchy.

"Since they were originally allocated, those two models have also needed a lot of additional investment to meet the new emissions regulations and to electrify their powertrains.

"The team in the plant still has the full confidence of the company."

Nissan executive vice president for manufacturing and supply chain management, Hideyuki Sakamoto, said: "A model like X-Trail is manufactured in multiple locations globally, and can therefore be re-evaluated based on changes to the business environment.

"As always, Nissan has to make optimal use of its global investments for the benefits of its customers."

Mr de Ficchy said: "Nissan is investing heavily in new technologies and powertrains for the next generation of vehicles in our Sunderland plant. To support this we are taking advantage of our global assets, and with X-Trail already manufactured in Japan, we can reduce our upfront investment costs.

"We appreciate this will be disappointing for our UK team and partners. Our workforce in Sunderland has our full confidence, and will continue to benefit from the investment planned for Juke and Qashqai."

The Sunderland plant, which opened in 1986, employs 7,000 workers, producing around 2,000 cars a day.

Other Nissan models built at the site include the Qashqai, Juke, Q30, Note and the zero-emission electric Leaf.

The decision follows figures last week showing car production slumped by almost a 10th last year, leaving the industry on "red alert" amid continued Brexit uncertainty.

The Society of Motor Manufacturers and Traders (SMMT) said investment had effectively "stalled" amid fears over the UK's future trading prospects with the EU.

Just over 1.5 million cars left UK factories in 2018, a 9.1% decline on the previous year, and the lowest for five years. Production of diesel cars was down by 22% to 561,000 last year.

SMMT chief executive Mike Hawes said the fall in investment was "deeply depressing" and should send a strong signal to politicians to secure a Brexit trade deal.

Ford is seeking up to 400 voluntary redundancies at its engine plant in Bridgend, south Wales, while Jaguar Land Rover is to reduce its 44,000 workforce by 4,500 under plans to make £2.5 billion of cost savings - with most of the cuts in the UK.

Japanese firm Honda has announced six non-production days in April under contingency plans to mitigate the risk of disruption to production at its Swindon factory after the UK leaves the EU.