SACSEA/Viceregal York MW102 was allocated to Lord Mountbatten during his time at South East Asia command, and afterwards when he was the last Viceroy. Negotiations around the independence/separation of India and Pakistan involved extensive travel, both within the region and to and from the UK. Lady Mountbatten and Pamela, his daughter, accompanied him on many of these trips, suggesting that he must have had a lot of confidence in the reliability and safety of the aircraft, as indeed, must those in London.
As an aside, I recall reading that he was always insistent on keeping the outside of the aircraft looking immaculate, and consequently after each trip, several men would be immediately sent out, cloths and cans of Brasso in hand, to get to work polishing. Rivet loss was common with this type of aircraft, and the constant polishing of the rivet heads just served to make matters worse, so another group would also have to be busy spotting and replacing all the lost rivets.