Thank you. You are correct. I had put back the category head elements but not the home page ones. Also, that description limit is a reply you gave me in 2011! (although I think the character limit should be 150, not 60)
However, can you clear up the question over the Yoast SEO WP plugin and the AIOSEO plugin?
Which is better for our stores:
A. WordPress SEO by Yoast (with built in Google Sitemap function)
B. All in One SEO Pack (Pro), combined with Google Sitemaps plugin
Seems there are advantages and disadvantages to both. I like the way the Yoast plugin gives an SEO check to ever post and page, and gives tips for improving them.