(Reuters) -Pendragon Plc said on Monday it had received an unsolicited preliminary proposal from its largest shareholder Hedin Mobility Group offering to buy the British car dealer for about 406 million pounds ($429.67 million) The cash offer, made on Sept. 21, valued London-listed Pendragon at 29 pence per share, nearly 28% higher than the company’s closing price of 22.7 pence on Friday. Last month, Pendragon said talks over a potential takeover of the group were terminated after an unnamed “large international corporate” withdrew its interest. Hedin, which holds a 27% stake in the car dealer…