Times (UK): The brick walls are grey, the sky is leaden, the alley is choked with dust and rubble as workmen fill in a long channel running along Tanggong Hutong, in the heart of old Beijing (Jane Macartney writes). The men have just finished laying an electricity cable as part of the sweeping campaign by China to clean up its act. Residents of this alley will no longer have to rely on filling their squat iron stoves with coal briquettes. Now their homes are equipped with electric …