Near the beginning of the episode in Ken Barlow's house Peter Barlow is shouting for Simon to hurry up or he'll be late for school. While Peter is storming back and forth he has a teacup in his right hand. He is swinging it around and we can see that the cup is obviously empty. When Simon comes out of his room Peter takes a drink from his (empty) teacup before setting it down.
Near the beginning in Ken Barlow's house Peter is shouting for Simon to hurry up or he'll be late for school. While Peter is storming back and forth he has a teacup in his right hand. He is swinging it around and it is obvious that the cup is empty. When Simon comes out of his room Peter takes a drink from his (empty) teacup before setting it down.