(Reuters) – National Grid has cancelled a notice made earlier where it said it expected Britain’s electricity supply margin to be below a threshold needed for the country’s energy system to be balanced, National Grid is responsible for ensuring supply and demand are balanced in Britain’s energy systems. The grid operator had triggered a capacity market notice (CMN) on Monday afternoon from 1800 GMT, indicating a reduced surplus above the forecast demand and operating margin. “The capacity Market Notice originally active from 6:00pm on Monday 24th January 2022 has been cancelled,” it said. (Rep…