Is it possible to edit the Forum Update Page so that one can add the forum logo rather than show a simple black and white text message whilst the forum updates are running please?

If so, a pointer to the file to tweak would be a bonus.

Many thanks

You can change this by using the constant UPGRADING_PAGE 

example

define('UPGRADING_PAGE','/path/to/page.html');

If you are not sure how to use constants, you can see this here

 

Thank you Marc! May I just ask the path/to referred to, should it be /serverpath or http//www.site.com/forums/path ?

It would be the server path relative to your installation