I added both blocks of "Forum>Related Articles" and "Forum>Related Products" to the CMS pages of "Forums List Page" and "Forum Topics Page".
I then assigned some related products and related articles to the sample forums.
This resulted in the following error on the Forum Page -
" Notice: Use of undefined constant RELATED_PRODUCTS_TITLE - assumed 'RELATED_PRODUCTS_TITLE' in /var/vhosts/shop/blocks/block_products_related.php on line 78
Fatal error: Class 'VA_Products' not found in /var/vhosts/shop/blocks/block_products_related.php on line 185"