LONDON (Reuters) - Tesco , Britain's biggest retailer, has removed a photo on its corporate website of Alan Stewart, its newly appointed chief financial officer (CFO), after rival Marks & Spencer (M&S) (>> Marks and Spencer Group Plc) complained he was technically still its employee.

After M&S was alerted to the picture on Wednesday, it asked Tesco to remove it from the site, a source with knowledge of the situation told Reuters.

Stewart quit as M&S CFO on July 10 and is on so-called gardening leave, unlikely to start work at Tesco before the end of the year due to a six-month notice period and a non-compete clause in his contract.

Tesco's website had earlier shown a head and shoulders photo of "Chief Financial Officer Alan Stewart." There is currently no photo and Stewart is now described as "incoming Chief Financial Officer."

Stewart's picture had sat alongside that of Chief Executive Philip Clarke, although Tesco said on Monday Clarke was being ditched as CEO to be replaced by Unilever's (>> Unilever plc) Dave Lewis on Oct. 1.

Both M&S and Tesco declined to comment.

(Reporting by James Davey; Editing by David Holmes)

Stocks treated in this article : Tesco PLC, Marks and Spencer Group Plc, Unilever plc