Good evening Matthew and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the issue you have encountered that caused Google Maps to stop working properly.
I would love to help you with this topic.
I just went ahead and looked at your website.
Let’s use http://www.catholic-chaplaincy.org.uk/mass-time/chapel-st-thomas-12-15pm-weekday-mass/2017-01-20/ as an example
If you head to the “Edit Event” screen for that event, can you tell me if the Google Maps boxes are checked ? If not, please check them and update the event.
If that does not solve it, still from that screen, try clicking on “Edit Venue” which is going to lead you to the “Edit Venue” page.
Check if the Google maps related checkbox are activated. If not, please check them and update the venue.
If that does not solve it, still from that screen, try clicking on “Use latitude and longitude” checkbox and see if that helps.
Let me know how that goes.
Best regards,
Geoff B.