"Check height"
Is the Rad Alt discussion really worth being looked at in an area where AGL is more or less the same as MSL?
I think that little bit of 'more or less' might sometimes make quite a big difference.
Do Bar Alts give audio clues these days and the lag reduced to such a degree that in auto or in high rod that you would consider it more beneficial than a rad alt in areas of low lying ground?
Be interesting to hear how the Dutch would undertake autos at night in Mr S's world.