I've finally managed to get hold of some code which allows the new abbreviated front page of my Blog. This new format sees each 'long' post have a brief summary on the front page with a link to the full article.
The code I've used, is a slightly modified version of some I found I found at Anything Else which is very clever and also allows for shorter posts which do not link to a larger page. (This current post is such an example.)
I have adjusted it slightly from the version indicated to allow for a summary which is not a part of the actual post.