LONDON—More than 1,500 trucks were stranded in England on Tuesday morning amid fears that Britain could face food shortages if travel restrictions put in place to slow the spread of a new strain of the coronavirus aren’t lifted soon. Dozens of countries around the world have slapped tough travel curbs on the UK in recent days: From Canada to India, nations banned flights from Britain, while France barred the entry of trucks from the country for 48 hours from late Sunday while the strain is assessed. Home Secretary Priti Patel told BBC radio that the British government is “speaking constantly” with France to achieve a swift resolution in order to get freight moving again. In the meantime, trucks were piling up in Kent, the county in southeast England that is home to some of the most popular cross-Channel ports. Patel said 650 vehicles were lined up on the main highway …