Passage: Westminster Cathedral, or the Metropolitan Cathedral of the Precious Blood of Our Lord Jesus Christ, in London is the mother church of the Catholic Church in England and Wales.\n\nQuestion: Based on this passage, what is the main catholic church in london?
Let's be accurate as possible. Think before you answer.
Westminster Cathedral , or the Metropolitan Cathedral of the Precious Blood of Our Lord Jesus Christ
To answer the above question, the relevant sentence is: Westminster Cathedral, or the Metropolitan Cathedral of the Precious Blood of Our Lord Jesus Christ, in London is the mother church of the Catholic Church in England and Wales.

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So, the final answer is Westminster Cathedral , or the Metropolitan Cathedral of the Precious Blood of Our Lord Jesus Christ