21:35Q.E.D.Series 17Episode 4: Pigeon PieBBC One Duration: 30 minutes Tue 11th Apr 1995, 21:35 on BBC One South WestAlexei Sayle narrates this look at how we can rid our skies of disease-ridden pigeons.GenresFactualScience & NatureScience & TechnologyBrandQ.E.D.SeriesQ.E.D.: Series 17 Source: BBC Online