Yes, most of the changes are behind the scenes - the score was to give people an initial assessment, thats all. Some people dont like it if their site acheives a low ranking - expected i suppose.
One thing about alt tags - the most important images are the first 3 - so even if this is just your nav bar, it is important to get them in - even if the image is a background to a table etc.
thanks for the feedback :)
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