It literally says he took it all
He says when a nurse tried to give laughing gas to Meghan for the pain there was none left. He describes how the nurse looked at the empty tank and then looked back at him:
‘I could see the thought slowly dawning. Gracious, the husband’s had it all. “Sorry,” I said meekly.’
Who nicks all the gas and air? I mean sure, have a bit, but leave some for the poor woman in labour 🤣