I agree rhsl that this was relatively straightforward, but 30d took up at least 20% of my solve time! Still pondering the relevance of the longest thematic, but the end game is really rather neat.
I'm sure that many of us old uns are fans of the theme. I was hooked at the age of eleven by the particular item on which this puzzle is based - sixty one years ago!
30d is troubling me. I have the writer and thematic items. If I enter the answer I have for 30d, 36a does not fit! Chambers does not appear to help (me, at any rate!)