“They said “We will visit London next week.” What is the correct indirect (reported) speech?”

"The direct speech “They said ‘We will visit London next week’” transforms to “They said that they would visit London following week” in reported form adjusting tense and time references. Reported speech in English ensures accurate conveyance of statements essential for clear communication in writing and speaking. Mastery of this grammatical rule enhances precision supporting effective reporting of conversations in academic professional and journalistic contexts ensuring clarity and coherence."