Yesterday I thought I would change my header and boy, do I wish I hadn't bothered. The new image looked blurry, so I tried two more times - the same thing. I therefore deleted it and re-loaded the previous one - guess what, blurry! I tried re-loading it many, many times and in the end asked Mr V-B if he could help. He googled Blogger to see if there were any problems and guess what, just yesterday they had changed something and there were a string of other bloggers who had experienced the same thing. Google are apparently aware of the problem but as far as I know, it is still not working properly today.
I therefore apologise for the blurriness of my blog header - the actual photo is very sharp - this is down to Blogger.
NB. The problem has now been fixed and here is my new blog makeover.