Southwark Cathedral

Southwark Cathedral (サザーク大聖堂) is a church of the Anglican Church, and one of its bases.

Principles
Like Westminster Abbey, there are deep places within the cathedral. Its defensive capabilities are implied to be at least in par with Index's Walking Church, though, at least in the deep places of the cathedral, which can apparently provide protection against Angel Fall according to Tsuchimikado Motoharu.

Since it is a stronghold of the Anglican Church, it was most likely taken over by the Knights of England during the English Civil War.