I've searched the database and done what I thought should be done to have the company logo favicon show on the blog http://www.thissideofthecross.com/blog1 but from the outset my personal avatar is showing instead - not even the admin avatar...
It's just weird and looks very ego-centric having my own face up as the favicon!!
I'm using a theme called muliplex 51 to match my main site - but changing themes doesn't seem to fix the problem, so it's more fundamental than theme specific code. The favicon is sitting there in the root directory for the blog (www.thissideofthecross.com/blog1) along with the blogs index page, properly named favicon.ico and in the right format.