London, April 9 -- Jaguar Land Rover (JLR) shuts its UK plants on Monday for five days over Brexit, adding to other shutdowns to leave at least half the country's car production off-line in what could be a pivotal week for Britain's divorce from the European Union (EU). The move by Britain's biggest carmaker, to prepare for any disruption resulting from Brexit, was taken a few months ago at a time when the departure date-since extended to April 12-was March 29. Automotive firms face a number of possible risks under a disorderly Brexit, including delays to the supply of ports and finished models, new customs bureaucracy, the need to recertify models and an up to 10% tariff on finished vehicles....