OFFENSIVE flyposters urging Muslims to rise against British oppression are upsetting Saltley residents who have been bombarded with radical material for years.  The latest batch of propaganda has appeared all over Alum Rock on telephone boxes, bus stops and street lamps.  The offending material, which is littering several roads including Alum Rock Road and Coventry Road, has been there for the past two weeks.  A Birmingham city council spokesman said: We take this issue very seriously and are looking into it.   If it was British nationalist propaganda it would have been taken down by now and the group responsible would be facing a prison sentence.  The Saltley Gate Peace Group has moved swiftly to condemn the latest batch of propaganda.  The group, based at Saltley Methodist Church in Alum Rock Road, has written to West Midlands Police and the city council urging that the controversial posters are ripped down immediately.  Although it seems they have waited two weeks to demand this.  Adam Yosef, who chairs the SGPG, said: It brings great distress to residents in Saltley and the wider inner city areas, when communities who have worked so hard over the years to build and regenerate their neighbourhoods, are suddenly faced with the problem of vandalism on such a large scale.    Since when has promoting violence against the Goverment and the British people been downgraded to vandalism?  Mr Yosef said similar material had been posted in the past by radical political and religious groups Al-Muhajiroun, Al-Ghurabaa and Hizb-ut-Tahrir. Material dating back to 2003 and 2004 is still on public property.