Bomb damaged windows from Derry are painstakingly restored in Belfast under the watchful lens of Ulster Television. An IRA bomb that destroyed the interior of the Guildhall in 1972 shattered these windows. We join Jack Calderwood and his son Stephen four years later as they restore the stained glass using the original 1912 watercolour designs by the Campbell Brothers. These drawings remain in safe keeping with Calderwood family. Attacks on churches and decorative buildings during ‘the Troubles’ generated a wealth of experience making Belfast leading experts in glass restoration.