Umberslade Baptist Church, south of Birmingham. Decommissioned, but still looked after by the local community.
Would love to do some research on this. It was build by the sons of George Muntz. George Snr made a lot of money out of Muntz metal, a cladding for ships that reduced fouling. He was also an MP and a political reformer, but with a reputation as an egotist. Very little obvious record of his son's actions and motivations for building a non-conformist church of such proportions.
Just up the road from me is Muntz park, which borders Umberslade Road, so the family affected my local area too.