LONDON (Reuters) - A disc jockey who police believe could be Britain‘s worst serial rapist was given four life sentences on Friday for a series of brutal attacks on women. Richard Baker, 34, wept in the dock as judge David Stokes passed sentence and branded him "truly depraved and wicked". Police still probing Baker‘s crimes believe he may have raped up to 100 women. Baker, arrested after a tip-off from his older brother, was convicted last month of raping and sexually abusing twelve women during a seven-month period in south England. But police are convinced Baker raped many more women, many of them in Spanish nightclubs where he also worked, and say he sedated some of his victims with a powerful sleeping drug. Baker threatened most of victims with death unless they complied with his sexual demands. One woman he raped told the court that Baker‘s ultimate thrill was to terrify, humiliate and make his victims squirm with fear. "You treated women with complete contempt," the judge told Baker. "You are a truly depraved and wicked man who is a danger to women for the foreseeable future." Stokes said Baker would not be considered for parole until he had served a minimum of 12 years and five months and stressed that even then he should must not be released until authorities were satisfied he no longer posed a danger to woman. "He is a practised and forceful liar," the judge said. "Anything he says should be looked at very carefully indeed." Baker had previous convictions for rape and unlawful sexual intercourse as well as for bribing an alleged rape victim not to give evidence against him. Baker‘s lawyer said it was clear from psychiatric reports ordered by the court that the rapist had himself been abused as a young boy.