The DNS is mapped to the IP address for the server and all works well apart from the SSL. The subdomain where it actually lives ( https://placemanager.goodlocally.com ) is secure as we use LetsEncrypt on the server with wildcards to secure it, but obviously https:placemanager.co.uk is not secure (or does not appear so) and throws warnings.
What is the best method for actually securing placemanager.co.uk in these circumstances? Do I need to list placemanager.co.uk as an add-on domain on the hosting server and issue a LetsEncrypt certificate from there or will it fail the ACME Challenge? Or do I somehow set up an SSL on the domain name elsewhere - perhaps with the DNS host?