New Overview page on the GT website

Following on from working on the presentation [see last post], I've also spent some time putting together a photo Overview page for the site. I'm always conscious that it's a biggish site to cover a single journey – 1300 photos for a start – so the Overview page is meant to be an introduction to the 'best' bits. Not quite as straightforward for me as it looks as I want to load different numbers of photos depending on the size of the viewer's browser window, but I think it's OK.