He had no idea of giving up London in the Spring and early Summer.

But why keep up a house in Berkeley Square, as Lady Clavering did not use it?
He was partly driven to this by a desire to shake off the burden of his brother.

When Archie chose to go to Clavering, the house was open to him.

That was the necessity of Sir Hugh's position, and he could not avoid it unless he made it worth his while to quarrel with his brother.
Archie was obedient, ringing the bell when he was told, looking after the horses, spying about, and perhaps saving as much money as he cost.
But the matter was very different in Berkeley Square.

No elder brother is bound to find breakfast and bed for a younger brother in London.