Originally Posted by BOAC
3 UK operators in my flying time have always added 50' for a 737, including BA
I can confirm that one of those operators, at least in 2008, required that 50ft be added to NPA Decision Altitudes published in the Performance Manuals (as per Part A(1) Manual).
Edited to add: exceptions are "dive and drive" approaches (e.g. JFK Canarsie, etc.) and RNAV Final Approach procs