Is there a way of sending emails when the Reporter changes, regardless of when the ticket is created.
Yes, you could use the Automation feature to set up a rule to do that.
I am painfully new to Jira, is there any pointers you can offer.
Atlassian's documentation for the feature starts here:
https://support.atlassian.com/jira-software-cloud/docs/automate-your-jira-cloud-processes-and-workflows/
The rule would look something like this.
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