I have been researching the old Convent, Penylan. We used to visit in approx. 1964 when it was derelict and there was a nightwatchman living there -here is some history, which I hope you will find interesting :-
" THE SISTERS OF THE GOOD SHEPHERD, CARDIFF. TO THE EDITOR OF THE TABLET.
SIR,—The Sisters of the Good Shepherd have been established at Penylan through the kind liberality of the Marquis of Bute, who has built them a house and furnished them with the means of carrying on their holy work amongst the poor outcasts of society. These good Sisters are indefatigable in their exertions ; they have filled the house fuller than full, and the very corridors are crowded with beds ; but it is impossible work to find food and clothing for a large community of some fourteen or fifteen nuns and ninety women, fighting their way back, poor creatures, to virtue and to God ; but the Sisters are brave—they spare no trouble or cost ; quite contrary to their custorct they are driven to beg in the streets of Cardiff from door to door, and of the produce of their little farm-yard, furnished with two or three cows, a few fowls, and some ducks, they sell fresh laid eggs and fresh sweet butter and milk, and buy cheaper and rougher food for their own use. A little timely assistance would enable them to do their work better, and to go on without risk of exhausting their strength by their zeal and holy charity in the service of Christ's poor.
The address of these servants of God is, Convent of the Good Shepherd, Penylan, Cardiff.—Always yours in Christ, FRANCIS C. GALLINI, Chaplain. "