LONDON — Almost three-quarters of England is now in drought, the British government said on Monday, highlighting the worsening impact of prolonged dry weather on agriculture, public water supplies and wildlife. Most of the country, 71.3 percent, is now experiencing a flash drought caused by a combination of very low rainfall and higher temperatures. That has risen since late July, when almost half the country was declared to be in drought. The latest update put 45 million people in a drought area and 27 million living under restrictions on water use. Britain is in the grip of its fifth heatwave this year and England and Wales have provisionally recorded their driest July in 190 years. Southeast England received just 1 percent of its expected average rainfall. "We know how challenging this summer has been ... We are stepping up our support including working to make it easier for farmers to build more on-site irrigation reservoirs," Water Minister Emma Hardy said in the statement. Rivers, reservoirs, and groundwater levels continue to decline while the continued hot and dry conditions are