Police were ordered by two of the British government's legal officers late Friday to return material seized from the British Broadcasting Corp. during a raid aimed at finding the source of a report concerning a secret spy satellite. Police said three of the films taken from the BBC's Glasgow, Scotland, office two weeks ago had been returned. The BBC last month decided against airing a portion of a six-part documentary series on secret government activities on national security grounds. Journalist Duncan Campbell, who produced the series, published an article using the sensitive material in the leftist New Statesman magazine, outraging the government of Prime Minister Margaret Thatcher, which said the article and the BBC program violated Britain's Official Secrets Act. The BBC said it plans to show the remaining five parts in the near future.