So now I convert my OSGB36 data to LLA ... oh ... that looks ... hard

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You can use Proj4.jl to convert your OSGB36 X, Y data to WGS84 Lat, Lon:

using Proj4
src = Projection(Proj4.epsg[27700])     #  [m] OSGB 1936 / British National Grid
tgt = Projection(Proj4.epsg[4326])      # [deg] WGS84 = ETRS89 = EPSG: 4326
Xs, Ys = 426642.0, 380231.0
Proj4.transform(src, tgt, [Xs, Ys])     #  -1.6015368, 53.3183427
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