The following is taken from Simon Knott's Suffolk Churches website.
Holy Trinity was built as a result of an Act of Parliament that tried to respond to the needs of the new industrial areas. However, the act didn't provide much money for building, so the style is what was popularly known as Carpenters' Gothic, with a local architect (Harvey) and craftsmen keeping within a tight budget.
The big mystery about Holy Trinity is why it was built here at all. Cautley says it was a chapel of ease to St Clement, in which parish it was built. But I do not think this can be right, since St Clement is only 100m away up Fore Street. The two churches would have been less isolated from each other by traffic in those days than they are today, and St Clement would have been at the heart of the more densely populated area. Perhaps, pre-restoration St Clement was unusable? At a time of tight budgeting after the Napoleonic war, it might have been easier to attract funding for a new church in an industrial area than for restoring the old one. Or perhaps it only became a chapel of ease later. In any case, St Clement closed in the 1970s, and the other church in the parish, St Michael, in the 1990s.
The interior of this church is one of Ipswich's best kept secrets; it is fabulous, and of outstanding interest, because there is simply nothing else like it anywhere in East Anglia. Pevsner calls the style of the chancel Georgian Baroque, and it is a quite remarkable feature. A sumptuous interior creates a focus for the more functional nave, with its prayer-book gallery and simple wooden benches. It is a juxtaposition which is at once harmonious and startling - you can see images below. perhaps the best known feature of the church is the east window, a memorial to the dead of World War I, which was produced by a relation of the Vicar - again, it is remarkable, with echoes of Powell & Sons, but an idiosyncracy of its own. There's nothing else quite like it. Given the current emptiness of the parish, the fact that it commemorates the lost boys is especially moving.
You are looking for a micro cache - in a high muggle area so stealth is required. Tweezers will be required to remove the log for signing. Bring your own pen.
If you would like to add to the Church Micro series yourself then please look here
http://churchmicro.co.uk/
There is also a Church Micro Stats & Information page that can be found at
http://www.15ddv.me.uk/geo/cm/index.html