Hello Again,
Okay so it looks like what is happening is:
the http www version is 302 to the https.www version and the https.www version is 301 to the non-www. So what you have is one redirect pointing to another redirect.
This is likely confusing Moz, or Moz has in the past crawled a different version and has more data for that so it wants to show you it instead.
The headers are:
http://www.a-fotografy.co.uk/
302 Found
Status: 302 Found
Code: 302
Date: Thu, 31 Dec 2015 12:43:08 GMT
Server: Apache
X-FRAME-OPTIONS: DENY
X-XSS-Protection: 1; mode=block
Location: https://www.a-fotografy.co.uk/
Cache-Control: max-age=0
Expires: Thu, 31 Dec 2015 12:43:08 GMT
Vary: Accept-Encoding
Content-Length: 214
Keep-Alive: timeout=10, max=200
Content-Type: text/html; charset=iso-8859-1
Connection: close
https://www.a-fotografy.co.uk/
301 Moved Permanently
Status: 301 Moved Permanently
Code: 301
Date: Thu, 31 Dec 2015 12:43:08 GMT
Server: Apache
X-FRAME-OPTIONS: DENY
X-XSS-Protection: 1; mode=block
Location: https://a-fotografy.co.uk/
Cache-Control: max-age=0
Expires: Thu, 31 Dec 2015 12:43:08 GMT
Vary: Accept-Encoding
Content-Length: 234
Connection: close
Content-Type: text/html; charset=iso-8859-1
https://a-fotografy.co.uk/
200 OK
Status: 200 OK
Code: 200
Date: Thu, 31 Dec 2015 12:43:08 GMT
Server: Apache
X-FRAME-OPTIONS: DENY
X-XSS-Protection: 1; mode=block
Accept-Ranges: bytes
Content-Length: 21886
Cache-Control: max-age=0, public
Expires: Thu, 31 Dec 2015 12:43:08 GMT
Vary: Accept-Encoding,User-Agent
X-Powered-By: WP Rocket/2.6.15
Connection: close
Content-Type: text/html; charset=UTF-8
What you want to do is get all your redirects to 301 to the correct version.
This should cover it in your .htaccess file
EDIT 01/07/2016: Please see the below responses for corrected code.
#If http is requested (ie https off) then redirect to https none www
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} ^www.(.)$ [NC]
RewriteRule ^(.)$ http://%1/$1 [R=301,L]
#If https is requested (ie https on) then redirect to https none www
RewriteCond %{HTTPS} on
RewriteCond %{HTTP_HOST} ^www.(.)$ [NC]
RewriteRule ^(.)$ https://%1/$1 [R=301,L]
Hope this helps,
Don