The site works for some content, on www.tanhive.co.uk but there are a few problems that need validating and sorting out, and you must be very strong with this mix of technologies to ensure everything works together.
Centos 7/ LEMP/ SSL (Global Sign certificate installed), Varnish/Nginx/Magento/PhP/mariadb
Immediate problems are:
Installing PHPMYADMIN is problematic, please install and get it working.
Developers complain that updates they are making to the site are not being reflected in the site (CSS files amongst others).
Magento isn't sending out mails like it used to when for example there is a user account password reset.
Document the setup so I know how NGINX, Varnish,SSL etc. are all working together.
Get the mail server setup (postfix/dovecote/other...)
Get SFTP setup for both domains to enable developers to upload their releases: dev.tanhive.co.uk and tanhive.co.uk
The domain dev.tanhive.co.uk is not working, it needs setting up.
The Cookie message installed on Magento...