Missing fire-control equipment after Soviet service

What advanced equipment was missing, and why would the Soviets have wanted it?

Fire-control computers, because Soviet battleships needed systems that had been expected from Germany while domestic development continued.

Fire-control computers are identified as the equipment the Soviets wanted from the British. Their own battleships lacked suitable systems, and the expected German supply had not resolved that need. The later reply recalls an upgrade before the ship entered Soviet service but doubts that she carried Britain's best equipment. The suggestion that Britain anticipated what would happen remains speculation.