From the Bristol Cathedral website:
"At the west end of the cathedral we stand at the exact point to which the nave of 1140-65 reached.
The nave, which was being rebuilt, but was never finished, at the end of the Middle Ages, also reached to here.
This part of the building, eastward to the western pillars of the central space under the tower, was begun by GE Street in 1868.
The two west towers were added in 1888.

"Street built this new Nave on the line of the old foundations, put in in about 1500,
and followed the architecture of the Choir in his principles of construction."