Only thing was, I needed a slight alteration (one of the fields wasn't suitable for my needs). I asked about this in the forum, and the next thing I knew, the developer was making a new version of the plugin to suit my needs and emailing it to me.
He even assisted with migrating from one version to the other.
Absolutely outstanding. Thanks!
Ingenious idea, well thought through in terms of available parameters. I had it downloaded, installed, configured and successfully tested in about two minutes. Many thanks for this plugin.