Hello John Wiltshire,

You can give a class for your span tag and add data id using qweb in xml
xml code:


then in js give any click event for that class
js code:
events: {
"click .your_class": "your_function",
},
your_function: function () {
console.log('Clicked Class');
//Here you give a data id for span tag
}

Thanks & Regards,
Email: odoo@aktivsoftware.com
Skype: kalpeshmaheshwari