Just curious how you and LF manage to fill in the gaps.
I have some FL appointments for 1975-1976. Some of my details come from newspapers but a large number are from match programmes. While the latter will obviously not pick up on the very small number of changes to referee (I'd estimate about five percent) match programmes are generally much more accurate than newspapers in giving the correct name of the scheduled referee. This means they avoid some of the issues you've mentioned where referees with the same surname / initial have been transposed as well as the problems of typos. Where a referee isn't known by the first of his names (e.g. Reg Robinson) the programme is more likely to call him by his preferred name so we avoid the same referee being billed as H. Robinson, H.R. Robinson or R. Robinson.