At the moment I can see Unread Posts for ALL forums, using this link at the top of the page of the main forum page:
View unread posts
But it shows posts from lots of forums I usually have no interest in, and it gets quite laborious to go looking for posts from a specific forum, especially if they are on the 2nd, 3rd, etc page due to other forum posts. While I think I have now managed to manually construct a search URL that does the above for a single forum, it would be very helpful for other people if there was just an easy link they could click on (on each single forum's page).
For interest, here is the URL I use:
where # is the forum's number.