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.

Question: Based on this passage, what is the main catholic church in london?
Steam of consciousness below:
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.
So, the answer is Westminster Cathedral , or the Metropolitan Cathedral of the Precious Blood of Our Lord Jesus Christ.