see Poland Street 1 to 9 & 49 to 62 in London Addresses dataset
James Billington ratebooks 53 Poland St 1789-95 / many ads from World 3.1.1788 to Morning Herald 19.5.1792 Mrs Billington 53 Poland St / Elizabeth Billington DNB 1765-1818 dau of Fredrica Weichsel (QV*) / British History Online says they lived at 54 Poland St / (SunFire 1792 James Billington 16 Michaels Place, Brompton)