FILE PHOTO: A tyre is seen on Jaguar Land Rover's I-PACE concept car on display ahead of it's 2018 production launch as Jaguar's first fully electric SUV at their 'Tech Fest' in London, September 7, 2017. REUTERS/Toby Melville

LONDON (Reuters) - Jaguar Land Rover (JLR) has made clear they regard Britain as home and are investing in the future, Prime Minister Theresa May’s spokesman said on Thursday.

JLR, Britain’s biggest carmaker, is set to announce “substantial” job cuts in the thousands, a source told Reuters, as the company faces double-digit drops in demand in China and a slump in sales for diesel cars in Europe.

“JLR have been very clear that they regard the UK as home and are investing in the future to develop the next generation of vehicles. We will continue to work closely with the company to support their long-term plans,” the spokesman said, noting that there had been no official announcement on job cuts yet.