The workmanship, by a disciple of William Morris, you can see for yourself in this shot:
And in its setting within the apse in the photo below:
This is a unique church in the Ordinariate in that it was originally Anglican, but fell on hard times with the bombing and destruction of the homes close to Portsmouth's historic docks, following hard on the Great Depression and the Great War. The worshippers were part of the Traditional Anglican Communion until the Ordinariate was erected, and as such they have an English Missal rather than a modern Roman Rite churchmanship. It is true, and I mean to write about this soon, but significant variations in churchmanship do exist in the Ordinariate - unsurprisingly, if one considers the fact that there are big variations in style and ritual within Anglo-Catholicism.
Along the south aisle, St. Agatha the Virgin and Martyr stands beside her altar, crowned, and clothed in this photograph in blood red for the patronal festival.
Apparently they have a new website coming soon, but there are more pictures here. The next big event taking place there is the Solemn High Mass on Saturday 27th September at 11 a.m., for Our Lady of Walsingham's feast.