Thanks for your help guys but the reply I put has sorted it very well. No bother with having to edit any files other than functions.php (which for a child theme is perfect)
This was the link again http://adambalee.com/search-wordpress-by-custom-fields-without-a-plugin/
Thanks again for your help.
Paul
Hi John, I didn’t really want to use that plugin as it looked like it would lose control over a few things.
So, I did another search today and this was worked first time. http://adambalee.com/search-wordpress-by-custom-fields-without-a-plugin/
Really handy as I just add it to the functions.php. It’s adding an JOIN to the query but I haven’t noticed much in the way of speed loss so I’m going with this.