[3] The church is famous for its Grade II* listed organ, which was purchased in 1747 by the parishioners from the 1st Duke of Chandos and is believed to have been played by Handel.

[6] The bishop sent 14 oak trees from his estate at Farnham Castle to use as pillars inside the new church, transporting them to Gosport by ox and cart.

In 1730, a fast-growing population and lack of convenient seating led to a gallery being built on the north side of the chapel and a portico added to the west end.

[11] The church underwent substantial remodelling in 1887 by architect, Arthur Blomfield, to mark Queen Victoria's Golden Jubilee.

Instead, he added an iron screen across the west end of the building, installed a new altar from St Agatha's, Landport and removed the galleries.

[14] Holy Trinity has thus ended up with an unusual fusion of architectural styles – a Victorian façade, but with a classical interior ordered for Anglo-Catholic worship.

Nikolaus Pevsner said, of Blomfield's work: "He turned the old plain building with its low-pitched nave, tall, steep-pitched aisles, and apsidal chancel into a rather crude and simplified version of a Lombard basilica.

[19] Although Holy Trinity had had Tractarian leanings for 50 years by this point and celebrated weekly Communion, Matins had remained the main Sunday service.

In 2020, the benefice of Holy Trinity and Christ Church was reorganised by the Diocese of Portsmouth into a single parish, along with St John's Forton, which was deconsecrated and redesignated as a "mission hub".

[32] Following the departure of Alex Wood in July 2022,[33] Revd Ray Driscoll was appointed as lead vicar, with overall responsibility for the parish, and the formal link with Harbour Church was dissolved.

[34][35] Christ Church retains its evangelical reorientation, and the combined parish therefore has a wide breath of theological and liturgical diversity.

The reorganised parish of Holy Trinity, Christ Church and St John's, was named 'Gosport South' as an interim measure.

[39] Holy Trinity remains an active Anglo-Catholic worshipping community, with mid-week and Sunday celebrations of Mass, as well as a weekly service of Exposition of the Blessed Sacrament and Benediction.

[41] † Vicar died in post Holy Trinity has a unique, Grade II* listed pipe organ, much of it nearly 300 years old.

It is therefore listed in the Institute's Register of Historic Pipe Organs as being an instrument of importance to the national heritage and one deserving careful preservation for the benefit of future generations.

This is a reproduction of a 15th-century piece by Renaissance artist, Andrea della Robbia, from 1489, the original of which can still be seen at the Ospedale di San Paolo in Florence.

[51] Following the consecration of Holy Trinity by Peter Mews in 1696, the church wardens, William Mansfield and L Andrews, presented the Bishop with an ornately framed coat of arms in 1703.

The rest of the church's windows were coloured, to a design still visible in the side-windows just inside the main entrance, until 1959 when they were replaced with clear glass to allow more light into the building.

Of particular interest, on the north side of the church, is a memorial to the six children of Henry Needham Scrope Shrapnel, four of whom died within the space of three months.

*Punctuation and decapitalisation added for readabilityShrapnel worked as a barrack master in Ireland, Bermuda, Halifax and Montreal, and following his retirement in 1866, he emigrated to Canada.

[56] The brass eagle lectern was presented to the church by colleagues, friends and family of Edward Lewis Lucy Shewell, the headmaster of the local Burney's Academy, following his death at sea, aged 56, on 5 May 1887 in a collision between two ships in the Mediterranean.

[citation needed] The reredos was gifted to the church by local merchant, Edwin Bishop, in 1892, having brought it back from Italy with him.

A statue of Saint George was given to the church in about 1944 by parishioner, Ruby Pope, and family, in memory of her brothers, Alfred and John Hindry, who had died in World War II.

St Agatha's quickly became an institution and a symbol of the Anglo-catholic faith in the Church of England, with all of its work centring on the altar.

Died at Woodlands House, near Holford, Somersetshire, September 25th 1889, when the bell tower given by him to this church was in course of erection... ...and those of Dolphus Frederick Nichols, his brother, born at Gosport, 25th February 1811.