Hi - sorry for the time it's taken to respond. But we've been listening very closely to the feedback. This is an issue that we have pushed up the 'fix' ladder...
The tech guys have been looking hard into this over night and we hope to be able to introduce an update to the site later today/tomorrow. This will ensure that when the image loads on your screen, it's never taller than the height of your screen (unless, for example, your using a mobile screen on landscape)!
Thanks for the feedback.