I’m sure this has been covered a squillion times before but advice please. EICR on block of 5 flats all with separate supplies & meters. One boiler serving hot water via one system to all flats. Main bond to water and gas on entry to building. There is no bonding locally within the flats themselves. If main bond on entry is in place for a shared water / heating system I was thinking C3 for no local bond within flats