I thought I'd solved this but I've tried to replace the default logo with css by removing the default img code at http://siphotography.co.uk. This is because I need a hover state (white logo to yellow using a sprite png) on the logo where an won't do. However, the logo is now failing to show (it did work previously).
I've altered the sidebar.php to echo a div and commented out the original php for the logo but I'm guessing there is an easier way to do it. Please let me know if I've not explained myself very clearly.
Any help is appreciated and thanks in advance.