Did a journalist spoof letters from your husband to a friend of your husband’s? - Margaret Thatcher: Dear Bill - Wikipedia.
Were you hurt by fire in an on-set sfx accident? - I’ll rephrase.
Did you fall in love with an RAF vet but marry a photographer? - Yes, Princess Margaret.
DQ:
Best known as a songwriter?
IQs:
You are not Jacko. Were you hurt by fire in a pre-1970 on-set sfx accident?
Did Alex Kingston’s early career get a big boost by playing you?
Is your tomb only a block away from your birthplace?
IQ1: Did you disable the Miracle Machine?
IQ2: Were you born with the name Wrynn?
IQ3: Did you betray your team, and did your much younger temporal duplicate have to deal with the ramifications of that?
Take DQs for 1 and 2. Congratulations on the level of obscurity reached. #3: I am not Marvel Girl (Jean Gray). Of course, you may have had someone else in mind; in that case, rephrase and ask again.
1 was Matter-Eater Lad, who defeated Omega by eating the otherwise absolutely invulnerable Miracle Machine that was powering him. (It did drive him insane, though.)
2 is better known as Mordru.
I’ll let 3 go, I had intended the answer to be Dirk Morgna (formerly Sun Boy) during the Five Year Gap, and his ‘temporal duplicate’ in the SW6 versions. Your answer is a good one too, though, with Marvel’s rehash of the SW6 plot.
Anyone more familiar than I am with early radio shows? It occurs to me that scripts for those haven’t been excluded. Also maybe a golden age comic book author who died quickly, or someone with a comic strip.