Hi nsathees, thanks for the reply 🙂 It was a custom-built CMS. Unfortunately the Import via RSS didn’t work (partial RSS feed etc…) so it was a direct database import, matching table to table.
Looking at the coding, the existing URL appears to be inserted into the WordPress database into the ‘post_name’ column
I managed to get it to work with the following rule
RewriteRule ^(folder/index2\.php)($|/) – [L]