OK, the blog is back up and running.
There have been some issues with the template design. I use Artisteer to customise the template, which loads its images to Picasa. Google has changed the way Picasa serves images, the default is no longer the actual image size. As a result the images were displaying too small on the blog. The workaround for the moment is to use ImageShack, rather than Picasa. This is working, but very, very slowly.