I want to know the answer to the following question:
Under whose reign did the last major building works take place?
All the background I'm provided with is that "The last major building work took place during the reign of King George V when, in 1913, Sir Aston Webb redesigned Blore's 1850 East Front to resemble in part Giacomo Leoni's Lyme Park in Cheshire.". Is that enough to answer the question?
Answer: yes