BOAC... I think you are either misunderstanding something, or using differently based data
BA QRH A320 IAE 2 Rev Operative, Max Manual Braking, improves LDR from 50' by 5% (Dry) to 24% Ice over no Rev.
NB there might still be issues between a 1980s modern certification rules aircraft, and a 1960s retread hiding under some Grandfather rules
