Mill Hill Church

I don't think that's really true, calling this a "Mill Hill Church". Although it was the Mill Hill Missionaries who took charge of the parishes of Nungambakkam and Vepery sometime in the early 20th century, their hold on it remained only for about 20 years or so. In 1930, the control of these parishes was passed on to the Padroado Portugues do Oriente  (the protection of the King of Portugal). 

St Teresa's Church, which is the one being discussed, stands on Nungambakkam High Road. It is said this was originally a small chapel within the Bishop of Madras' house and that it began to grow only after the Mill Hill-ers took charge. The chapel was elevated to the level of a parish church in 1912 (and a centenary celebration is called for?) and has continued its growth since.

The Mill Hill-ers handed over the church to the Padroado in 1930. By that time, however, the Padroado was itself in the wane, what with the Padroado Real having given way to the Padroado Portugues do Oriente. The last vestiges of the Padroado disappeared in 1999 when Macau was handed over to China; but in Nungambakkam, this church (and the parish) was moved to the Archdiocese of Madras-Mylapore sometime in the 1950s itself!