A remarkable achievement. There was, however, an unforeseen issue. Sparrow had colonised the vast building and were leaving droppings all over the place! When touring the building with the Duke of Wellington, Queen Victoria is said to have remarked on this and wondered what could be done. The Duke, in his usual laconic manner, supposedly replied "Sparrowhawks, ma'am." and the problem was solved!

True or apocryphal? Hard to say, though the response is typical of the man!