By the description of what you see, it appears the URL you are using is:
https://www.ukworkshop.co.uk/whats-new/
This URL will show the first ten threads that have posts you have not read. Clicking on "View more..." at the bottom right of the page will show the rest of the threads with unread posts. The display will also continue with threads in the date order of the last post made that you have read.
If you do not want to see this, the URL you should be using is:
https://www.ukworkshop.co.uk/whats-new/posts/
This will show you only those threads with unread posts. If there are more threads than will fit on one page, you will see the page counter at the bottom left of the screen.
When you use the https://www.ukworkshop.co.uk/whats-new/posts/ URL as your saved bookmark, when the page loads, you will see a number appended to the end of the URL, such as:
https://www.ukworkshop.co.uk/whats-new/posts/19458
Do not copy the URL with the number as your bookmark. The number is a time stamp for the new post search function and will change throughout the day. If you copy the URL with the number at the end, then you will never see threads with new posts created after that point in time.