By Andy Silvester The owner of Royal Mail has this morning accepted a bumper new £5.2bn offer from Daniel Kretinsky’s EP Group, which could see the historic UK firm transferred to private foreign ownership. The board gave the thumps up to the offer from the ‘Czech Sphinx,’ a vast improvement on a previous £3.4bn tilt,in a statement to markets this morning. Kretinsky’s offer comes with ‘safeguards’ on job losses, UK tax residency and a host of other areas, but the bid will be scrutinised by regulators over the coming months. Shareholders will receive 360p per share as well as a special dividend…