Don't worry about it, after a bit of searching I found the correct line and have now sorted it.

That was fast :!:
So how about closing out this thread by telling the next person with this problem how you solved it?

I found the file _blog_main.php in the 'b2evocore' folder, on opening that file I changed the following line from

param( 'order', 'string', 'DESC', true );

to

param( 'order', 'string', 'ASC', true );

this reversed the order that the posts are displayed. Hope this helps anyone in the same boat.

I also like editing in "[SOLVED]" to the thread's original post title. ;)