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Thank you your suggestion seems to have fixed it

Thanks I never noticed that, I don't have a clue how to fix it, if I use non-www it takes me to www which is what it should do but it doesn't seem to work if it's in a product, I've tried adding

RewriteCond %{HTTP_HOST} ^www.harrisonlighting.co.uk$ [NC]
RewriteRule ^(.*)$ http://harrisonlighting.co.uk/$1 [R=301,L]

to my htaccess but them the site doesn't work

It's in the on-page, as part of the critical factors, doesn't really give me a reason for the error it just says

<dl>

<dt>Canonical URL</dt>

<dd>"http://www.harrisonlighting.co.uk/childrens-lights.html"</dd>

<dt>Explanation</dt>

<dd>If the canonical tag is pointing to a different URL, engines will not count this page as the reference resource and thus, it won't have an opportunity to rank. Make sure you're targeting the right page (if this isn't it, you can reset the target above) and then change the canonical tag to reference that URL.</dd>

<dt>Recommendation</dt>

<dd>We check to make sure that IF you use canonical URL tags, it points to the right page. If the canonical tag points to a different URL, engines will not count this page as the reference resource and thus, it won't have an opportunity to rank. If you've not made this page the rel=canonical target, change the reference to this URL. NOTE: For pages not employing canonical URL tags, this factor does not apply.</dd>

</dl>

I'm trying to use the On-Page report card and it's saying that my rel=canonical is wrong, I've looked and I can't see anything wrong with it, am I missing something?

The url is www.harrisonlighting.co.uk/childrens-lights.html

Oh and one final thing, I have a menu system that uses ajax, Google reports too many links on the page because it has the main link eg ceiling-lighting.html but then you can choose things like colour so it would change it to ceiling-lighting.html?colour=brass+supplier=another etc is this damaging to the site?

Thanks for the replies, I will leave them as they are, one other thing with regards to nofollow, does having more than one link to a page cause problems? for example on my product page the product title leads to the product so does clicking on the image and there is also a "more info" link that has the same url

Should I add NOFOLLOW to the links in the footer of my site like "about us", "Contact us" etc because they are in the footer they are on every page so would this harm SEO in any way?