The bread machine had been going for a few minutes and I was washing the breakfast things. It was just starting to mix when I realised it didn’t sound right; oops, I hadn’t put the mixing paddle in.
Switched it off, decanted the contents into a bowl, washed the inside bowl out. Once it was dry, replaced it, put the paddle in, decanted the bread mix from the bowl back inside and switched it back it.
It carried on as though it hadn’t noticed and still produced a lovely loaf of bread.