King Talal was a great king, and yes he had a sad fate, but I have some comments on your post Shelley, may be things that you don't know:
I wonder of what is written about him in the british records, because the british were not having good relations with him, and he was not there preference, and hat I know that they were against him, may be due to his progressive attitudes, and constitution which is (very) advanced one, etc. but may be I should not wonder of the british behavior to have a good record about him , as they may like his ideas but did not want him to apply it .. I will give an example in my next post.
The other thing what you said about king Abdullah I did not like him because of girl education, as there was girl education in the time of KA, and at the time of my grandmother who was a child when KA I was th king in the 20's girls were going to schools, and the old girl's school in Irbid is called "Musbah" which is the name of KA-I wife.
Third, assuming that his illness is due to his father treatment, is not likely because his father died , and he did great thing after that and became free of his father, the only pressure on him then became only from Britain this could be the reason.