Counter-terrorism investigators have made six arrests after disrupting what they believe was a “significant plot” to attack the UK that was influenced by Islamic State. Material recovered from an address raided in Derby has been initially assessed as being consistent with that needed to make homemade explosives, the Guardian understands. The arrests were intelligence led but past cases have shown that initial assumptions among investigators are sometimes incorrect because materials for making homemade explosives can also have innocent uses. It followed an operation by the domestic security service MI5 and counter-terrorism police. Counter-terrorism officials believe they have disrupted three attacks...