SEO 301 redirect errors

I logged on to my domain at my service provider server using Parallels and added this  .htaccess file to the root.

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

 Unfortunately I am still getting  “WWW redirect” and “Common home page variations” errors when I run my SEO program.(See attachments).

I am at a loss to know what to do or even if it really matters.  I am not sure I really need the non-www site at all in Google and I am tempted to just delete it on the dashboard.  I have set www.sowter.co.uk as my preferred URL.

What is puzzeling me is that I don't know the difference between a non-www and a www site from the point of how it is created.  I simply created the site using Dreamweaver which I think uses FTP but I dont remember ever deciding which type it was to eb.  How can I tell which it is?
www_sowter_co_uk_2015_10_02.pdf
Dashboard-clip.pdf
Brian SowterTechnical DirectorAsked:
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Jason C. LevineDon't talk to me.Commented:
I am at a loss to know what to do or even if it really matters.  

When you use RewriteRules to handle www or non-www urls, it's visible to "users" (i.e. Google) that you are redirecting them to a new URL.  Because rewrites are sometimes used for black-hat or malicious purposes, it's better to minimize your use of them but something like the above won't penalize you at all.  

tl;dr Don't worry about it, you're okay.

I simply created the site using Dreamweaver which I think uses FTP

Dreamweaver is a design tool. It doesn't deal with your hosting settings, which is the issue you are having.  Generally speaking you want to handle issues like with the DNS and that's not something you do in Dreamweaver.

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