OK. Grant it the nearest phone between the Old House and Collinwood may be at Matthew’s cottage, and that’s why Vicki chose to go there, but why she had to antagonize Matthew enough so that he confessed to killing Bill Malloy is quite beyond me. He’s grabs her, threatens her, makes her scream and still she won’t shut the hell up.
I wondered how Matthew got to the roof so quickly when he was only a moment ahead of Vicki, but with DS, who knows?