The Pub people are doing experiments at their next meeting. This is what they wrote on Facebook:
Our next meeting will be at the new venue of the Brewery Tap. It has the advantage that we can use a side room so any bubbling experiments can be more easily contained 😉 We’ll either be in the room immediately on the right as you go in, or upstairs.
Then, as an afterthought:
If you bring something that starts bubbling that isn’t beer, the garden area outside would be more appropriate.