The British Foreign & Commonwealth Office has begun to “advise against all but essential travel” to mainland China as the impact of an ongoing coronavirus outbreak continues to spread.
The warning comes in addition to earlier alerts urging British travellers to avoid all travel to the Hubei province.
Officials said earlier the outbreak had now caused more than 100 deaths.
It has spread across China and around the world to at least 16 other countries.
British nationals in Hubei have been urged to leave, if they are able to do so.
“The Chinese government continue to impose further restrictions on movement within China in response to the coronavirus outbreak,” the FCO said in a statement.
“It may become harder over the coming weeks for those who wish to leave China to do so.
“If you feel that you may want to leave China soon, you should consider making plans to do so before any further restrictions may be imposed.”
The latest advice does not include Hong Kong and Macau.
Due to increasing travel restrictions and difficulty accessing medical assistance, the FCO is working to make an option available for British nationals to leave Hubei.
“This may happen quickly and with short notice,” the government body warned.