The Red, Yeah, It Might Be a Different Red

Nick, Mick and Elphin weigh themselves in the bathroom. Nick's weight goes up by £2-300 grams after he has gone to the toilet. Dr Karl is alarmed that we might have something defying the laws of physics. We must seek out an aspect of control for these experiments. What you should do is weigh, here's a question. Have you been writing it down?