BBC Documentary
In the BBC Horizon documentary this evening, it was stated that Inmarsat's 'hotspot' for the location of MH370 was at around latitude 28S on the 00:19 arc position. This corresponds to the best fit position using all four BFO values from 19:41 to 22:41UT. This is the analysis in section 7.7 of my document referenced above. The track I selected to plot the BFO data in figure 15 in that section terminates at 27.4S.
So it seems that Inmarsat believed the analysis using all four ping values, while others in the investigation preferred to omit the 19:41UT BFO value, presumably because they thought it an outlier, thus getting best fit locations to the North, in the red-zone of the ICAO report.