During archaeological monitoring of substantial ground reduction on this site a culvert that predated, and was cut off by, the Co-op warehouse was briefly exposed. It was FULL of redware ceramic syrup-collecting jar fragments, with very few fragments of sugar-loaf moulds. I presume it came from a sugar house (refinery) in Leman Street in the 19th century. There were so many fragments of jars that I couldn't collect them, I simply selected out the whole vessels. I did -however- give the developers a particularly large base of a collecting vessel and they put it into the foyer of their newly refurbished building for a while, which they christened "the Sugar House". Maybe the find influenced their choice of name.
Sugar refining vessels, mainly syrup- collecting jars, in an old culvert behind 99 Leman St.
A picture of whole vessels is in Fig 16, page 358, on this link (Post-Medieval Archaeology, Fieldwork in 2006) https://doi.org/10.1179/174581307X236238.