[2] He designed a set of friezes for the exterior of Eatington Hall, as part of its remodelling in 1858–1862; they were carved by Edward Clarke,[7] Commissions for work at the Palace of Westminster, and the Albert Memorial helped Armstead to establish his reputation.

[2] At the Palace of Westminster Armstead carved eighteen oak panels in the Queens's Robing Room illustrating the legend of King Arthur beneath a series of murals by William Dyce.

Armstead took great care over the details of the subjects, asking surviving friends of Goethe, Beethoven and Mendelsohn for advice, and working from Carl Maria von Weber's death-mask.

[1] Armstead also sculpted the large fountain at King's College, Cambridge (1874–1879), incorporating a statue of its founder, Henry IV,[14] and numerous effigies, such as Bishop Wilberforce at Winchester, and Lord John Thynne at Westminster Abbey.

He died at his home 52 Circus Road, St John's Wood in north London on 4 December 1905[2] and is buried in a family grave on the west side of Highgate Cemetery.