Shanahan: "Of course. There are still electrical power lines to run the electrolysis and lines from sensors to data display and recording devices aren't there? Heat loss pathways."
Haha, Shanahan is throwing out another possible tiny fractional error, that would not be able to change the conclusion
Anyhow: Mckubre state 50 mW as the uncertainty region, as indicated by the control run, which will include also the tiny fractional possible error mentioned by Shanahan.
And the 1000mW+ excess power measured in P12 experiment is far away from the uncertainty.