I missed the church of All Saints out of the description of my tour of Poplar.   It’s a grand Greek Revival building, with crisp Ionic capitals and handsome cast iron railings, designed by Charles Hollis, who was clerk to one of the parishioners and entered the competition for its design under the pseudonym Felix.   It opened in 1823, six years after Poplar became a separate parish:-

The railings:-

The rectory, also by Hollis:-