See Castle Street East 1 to 15 & 11 Berners Street (in London Addresses dataset)
Alexander Robertson Land Tax 1780-1784 2 Castle Street East / SunFire 1794 Alexander Robertson, 16 Castle Street, Oxford Market, tailor
There were quite a few Alexander Robertsons around and it may just be coincidence that the two above were both in Castle Street. No Robertson appeared in Castle Street Land Tax lists in the 1790s so the insuring tailor above could have been a sub-tenant at Castle Street East or West., though East was perhaps more likely as John Gibson paid Land Tax at 16…