• Marks And Spencer Group average operating margin for 2012-03-31 was 0%, a 0% decline from 2012-09-30.
• Marks And Spencer Group average operating margin for 2012-09-30 was 0%, a 0% decline from 2013-03-31.
• Marks And Spencer Group average operating margin for 2013-03-31 was 0%, a 0% decline from 2013-09-30.

Operating margin can be defined as operating margin measurement of what proportion of a company's revenue is left over after paying for variable costs of production such as wages, raw materials, etc.