Thanks for your help so far, and sorry for my rather late reply! I have managed to partly resolve the error. I was just given this site so did not write it myself. It seems that embedded/includes/fields.php isn't being loaded, but instead another file located at /public_html/wp-content/themes/rug/embedded-types/includes/fields.php is being loaded instead, and this file was missing the function. I've added that in and am now receiving:
Fatal error: Call to undefined function wpcf_admin_can_be_repetitive() in /home/realuni/public_html/wp-content/plugins/types/includes/fields-form.php on line 956
Again, any light you can shed on this is very much appreciated!