Here is a question about this article: During the 19th century, it was not infrequent for the Foreign Office to approach The Times and ask for continental intelligence, which was often superior to that conveyed by official sources.[citation needed]
What is the answer to this question: Which century was The Times first often relied upon for continental intelligence?
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So... 19th century

Here is a question about this article: Loge continued during October. According to German sources, 9,000 short tons (8,200 t) of bombs were dropped in that month, of which about 10 percent of which was dropped in daylight. Over 6,000 short tons (5,400 t) was aimed at London during the night. Attacks on Birmingham and Coventry were subject to 500 short tons (450 t) of bombs between them in the last 10 days of October. Liverpool suffered 200 short tons (180 t) of bombs dropped. Hull and Glasgow were attacked, but 800 short tons (730 t) of bombs were spread out all over Britain. The Metropolitan-Vickers works in Manchester was targeted and 12 short tons (11 t) of bombs dropped against it. Little tonnage was dropped on Fighter Command airfields; Bomber Command airfields were hit instead.
What is the answer to this question: Which was targeted more heavily, bomber or fighter command airfields?
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So... Bomber Command airfields

Here is a question about this article: Since the middle of the 19th century, Masonic historians have sought the origins of the movement in a series of similar documents known as the Old Charges, dating from the Regius Poem in about 1425 to the beginning of the 18th century. Alluding to the membership of a lodge of operative masons, they relate a mythologised history of the craft, the duties of its grades, and the manner in which oaths of fidelity are to be taken on joining. The fifteenth century also sees the first evidence of ceremonial regalia.
What is the answer to this question: How long have historians been seeking information about the Masonic movement?
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So...
middle of the 19th century