He was appointed to a staff position at Indian army headquarters on 28 November 1899, as Deputy Assistant Quartermaster-General for Mobilization.

Philipps was re-elected in Southampton at both the January 1910 and December 1910 general elections,[9] along with his fellow Liberal William Dudley Ward.

He served in 1915 as Parliamentary Secretary to the Ministry of Munitions,[3] and was made a Knight Commander of the Order of the Bath in 1917.

However, Philipps and Ward were both defeated at the 1922 general election by Conservative Party candidates,[10] and neither stood again.

Since his death, the castle has been managed jointly by the Philipps family and Pembroke town council.