Having checked the MySQL checkbox, ther was an indication that MySQL was starting, but it never appeared as Running. I then tried Unchecking the checkbox, resulting in a message asking to uninstall the service. I confirmed this, the check would disappear but then reappear in the checkbox within seconds.
Closing Xampp, then restarting, I tried to start Apache and MySQL. Apache starts up and Running, but MySQL does not despite the message that it is started appearing in the Control Panel it does not show as Running. Both checkboxes are ticked. It seems impossible to uninstall the MySQL service, ie.e the checkbox remains ticked now. This is inspite of it being able to be unchecked earlier, as mentioned in an earlier post, when both the Apache and MySQL displayed the Running message.
I've just checked Status, and although the Control Panel doesn't say the MySQL is Running, the Status page says it is Activated. I do apologise, I am new to all this.