flagging a non-news node update

I have a members-only page on my website ( http://lynton-rail.co.uk) .

I would like to edit a block on the home page that currently provides a quick link to the page, so that it displays either the date/time the members-only page was last updated, or replicates the "updated" message seen on News item until the registered member has visited the page. Can anybody suggest how this might be achieved? 

Many thanks,