Add 3.420m to data values 1965-1998 to refer to RLR<br>Add 3.431m to data values for 1999 to refer to RLR<br>Add 3.422m to data values for 2000 to refer to RLR<br>Add 3.417m to data values 2001 onwards to refer to RLR<br>RLR is 8.300m below primary benchmark Attached BM W 61