TV Guide BBC Four Friday

Professor Robert Bartlett examines the impact of the conquest of Britain and Ireland, and learns how William the Conqueror built scores of castles and cathedrals to impose his control and intimidate the population. The ruler also commissioned the Domesday Book to survey the wealth of the land and raise revenue, and set in motion the linguistic and cultural transformation of England. The Normans blended well in Scotland, but faced fierce opposition in Wales, and promoted divisions in Ireland which some claim still exist to this day

DJ Pete Drummond introduces a classic concert by Bob Geldof's band from the Goldiggers, then a popular nightclub and concert venue in Chippenham, Wiltshire. The programme was first shown in February 1984, the same year that the lead singer would go on to found the charity Band Aid, raising money to combat poverty in Ethiopia

Documentary telling the story of how rock music evolved in Ireland over 40 years. The film demonstrates how the sounds that emerged were grounded in the musical traditions of the island's two main cities, from the pioneering touring showbands of the late 1950s through to the modern day. Richard Dormer narrates an examination of how the harder sounds of Belfast merged with the more folk-centric traditions of Dublin, celebrates some of the key musicians to have emerged from the Irish scene, and reveals how they were influenced by the political, social and cultural climate of their surroundings. With contributions from U2, Sinead O'Connor and Bob Geldof

Gail Porter presents the pop chart programme, first broadcast on 28 May 1999 and featuring Texas, Sugar Ray, Travis, Shania Twain, Sixpence None the Richer, Hepburn and Shanks & Bigfoot