I didn't think Bert was particularly well connected or well-to-do at the time...? In fact, Bert's life story (polygamy notwithstanding) seems to me to have been one of those 'never quite recognised for what he was' stories
Seriously, I think if you are looking "through all the well documented UK to Australia solo flights" then you are likely to only find those that are, errrm, well documented.
Even though there have certainly been several others, they have not been so well documented.
I don't think that means that you can only fly solo to Oz if you are well connected and/or well-to-do, but it probably does mean that those who have chosen to make a big thing out of their flights have been.
Some of those, and David Sykes is prime amongst them
, certainly deserve much more attention than they have received, but they have not received it either because they have not captured the media's eyes or because they have not wanted to capture the media's eyes...
What is your angle? Are you thinking of doing it and wondering whether you will need/how to find funding or connections or are you looking to write up a story about those who deserve more attention?
As an aside, there was also a fair amount of controversy over a recent flight, repeatedly referred to as 'solo' which was nothing of the sort.
B.