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Trying to add a right-hand column to posts to display on certain categories in WordPress. (In this instance, when posting a job vacancy under the category 'vacancies' I want a right hand column to be featuring job specs/details.

Any idea how I can achieve this?

You may achieve this adding some logic to functions.php:

Use in_category( 'vacancies', get_the_ID() ) to determine if the current post holds the wanted category, and then use wp_nav_menu() to display the wanted menu:

wp_nav_menu( array( 'theme_location' => 'Vacancies menu' );

Your first have to register your custom menu. See codex for details on how to do it: https://codex.wordpress.org/Function_Reference/register_nav_menus

The complete code would look something like:

<?php 
if ( is_single() && in_category( 'vacancies', get_the_ID() ) ):
      wp_nav_menu( array( 'theme_location' => 'Vacancies menu' );
else:
      wp_nav_menu( array( 'theme_location' => 'Standard menu' );
endif;
?>