It's been on mind for a while and I know that you'll all know the answer. Plantain Place goes off Crosby Row on the left as you're going North towards Guys. The two houses which flank the entrance to Plantain Place, they look like they were the entrance to a Workhouse - I know the small park opposite St Georges Church is on the site of the Workhouse - did the Workhouse cover that whole area?
I don't have any local maps beyond an A-Z. Does Pevsner say anything?