Phone number and address for marks and Spencer head office.

Marks & Spencer Head Office (Marks and Spencer Group plc), Waterside House, 35 North Wharf Road, Bayswater, Greater London, W2 1NW, T: 02079354422.

Retail Customer Services T: 08453021234. The M&S head office is located at Waterside House in central London, near the Heathrow Express and Paddington Station.

Up to now Marks & Spencer has only sold about 15% of the brand's homewares and clothing in sales online (compared with Next, which does around 35% in online sales), but that's about to change now that M&S opened an automated 900,000 sq ft warehouse this week in an effort to improve service for online shoppers. The new Castle Donington warehouse is expected to be able to handle a million orders daily.

Updated on Thursday, May 09 2013 at 11:29PM BST