ANNA: This man you're buying the exit visas from ... do you trust him? AVON: [O.O.S.] Trust him? Of course I don't trust him. ANNA: Well then? AVON: [O.O.S.] Trust is only dangerous when you have to rely on it. ANNA: That's very profound, my love. AVON: [O.O.S.] As long as I know I can't trust him there's no problem. ANNA: Do you trust anyone? Do you trust me? AVON: [O.O.S.] Oh, yes. I'm afraid I do. [In the cave.]
and there's a passage with Avon and Shrinker a little later.
In Blake, there's Tarrant's "it's difficult to tell who you can trust these days," and Blake's "I find it difficult to trust," and the whole tragedy IMO revolves *around* Avon's confusion over exactly how far he trusts Blake and perceived betrayal *of* that trust.
Even if the word itself isn't mentioned (I haven't checked them all), I do see it as a major theme in quite a few other episodes, the Cygnus Alpha/Time Squad duo, Bounty, Horizon, Powerplay and Rescue/Power (in which we see trust badly cracked by Terminal) at the least.
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