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My mistake  ... my old firm was an ISO Company 

Ha ha ha  Guinness  .....must still be thinking about the question. :B

All landlords meters.   Main meter not being touched .   Any testing needed ?    Thanks pal..

DNO's  ?    going to be changing old style meter's for new smart meter type .  pos moving some trunking also.     Also  what is max length allowed on meter tails. Cheers pal.

single phase meter in an office

NICEIC only require test meters to be calibrated once a year.

After replacing a meter , Dos'e it need testing  pos minor works  ?