“In a major disappointment to management at [Boston public broadcasting powerhouse] WGBH-TV, John Willis – the station’s vice president of national programming – announced yesterday that he is stepping down in June for a senior position at the BBC. Willis, a celebrated British filmmaker and former television executive in Britain, is leaving WGBH after just a year on the job.” WGBH produces many of the programs which air nationally on the PBS network, including This Old House and Evening at Pops, but the station has struggled in recent years to compete with a growing universe of specialty cable channels.