Input (grade 13): Wembley had opened in London only a few months earlier, the near-simultaneous development being a source of rivalry between the northern and southern divisions of builders Sir Robert McAlpine, who built both stadia.
Output (grade 8): Wembley had opened in London only a few months earlier. This made a source of rivalry between the northern and southern divisions of builders Sir Robert McAlpine, who built both stadia.