dx = 20 m, dy = -54 m, dz = 300 m.

Another empirical fudging approaches of Clarke 1880 modified are:

dx = -130 m, dy = 29 m, dz = 364 m (3-parameter method, negatively tested), or

a = 6,378,306.064 m, b = 6,356,757.924 m, f = 296.0026277906, e = 0.082129675119, e’ = 0.082408078318, shift from War Office to WGS 84 dx = -159.51 m, dy = 262.53 m, dz = 221.79 m, rotation to WGS 84 rx = -1.828, ry = -2.399, rz = -7.460, scale = 0, prime meridian shift = 0 ° (7 parameter method, unchecked at this moment, developed and used by private GIS firm in Ghana).

Latest research (Germany, 2007): Shift from Clarke 1880 to ITRF 05/WGS 84: dx = -155m, dy = 2.5 m, dz = 56.5 m, rx = -1.04 x 10-5 rad, ry = 4.78 x 10-5 rad, rz = -5.948 x 10-6 rad, scale = 1.00000632