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Add 5.974m to data values up to 1997 to refer to RLR (1990)
Add 5.669m to data values 1998-2002 to refer to RLR (1990)
Add 5.859m to data values 2003 onwards to refer to RLR (1990)
RLR (1990) is 11.9m below BM NH 1
LLD = Land Levelling Datum