Original: A new spate of expansive building was therefore initiated with Bishop John Drokensford starting the proceedings by heightening of the central tower and beginning a dramatic eight-sided Lady chapel at the far east end , finished by 1326 .
Simplified: A new spate of building was therefore started by Bishop John Drokensford . He heightened the central tower and began a dramatic eight-sided Lady chapel at the far east end , finished by 1326 .