Business Green: National Grid yesterday sought to downplay reports that businesses are having their gas supplies “cut off” as it battles to cope with the increased demand brought about by the on-going cold smap. The Guardian revealed yesterday that 94 businesses on ” interruptible” contracts have had their supply of gas cut off for the first time since the 1970s as energy firms seek to avert the risk of a gas shortage. The National Grid, which operates the UK transmission networks for both …