Mayfair, Greater London

Mayfair on Wikipedia.
 

Church of the Immaculate Conception (R.C.), on Farm Street, commonly known as the "Farm Street Church", and well worth a visit. TQ 285 805. © Steve Bulman. Another view, an interior view, and the Altar of the Seven Dolours, all © John Balaam (2008). Five further interior views - Altar of St. Thomas the Apostle, Altar of the English Martyrs, Chapel of Our Lady of Lourdes, Chapel of St. Joseph, Altar of St. Aloysius, all © John Balaam (2012). Link. Grade II* listed.

The Commonwealth Church (St. Mark) on North Audley Street, which was built in 1820. TQ 287 780. © Andrew Ross. Link.

Grosvenor Chapel (Anglican and Episcopalian), on South Audley Street. Photograph is a composite of two shots. TQ 284 805. © Steve Bulman. Another view, © John Balaam (2008). Link.

St. George Hanover Square, is more accurately on St. George's Street. TQ 2896 8092. © Bill McKenzie. Link. The History page tells us that this is a Queen Anne church, of 1721-5. There's a Wikipedia article about the Queen Anne churches here. Grade I listed.

Ukrainian Catholic Cathedral of the Holy Family in Exile, on Duke Street, just south of Oxford Street. Another view. It was built as the King's Weigh House Chapel (Congregational) in 1891, as this plaque explains. TQ 282 809. Both © Steve Bulman. Interior view, © Mike Forbester. Link.