see Poland Street 1 to 9 & 49 to 62 in London Addresses dataset
Frederica Weichsel nee Weirman in DNB Elizabeth Billington 1765-1818 / ad for Mrs Weichsel 7 Poland St 24.3.1778 & 8.3.1779 Morning Post, she died 1786. Her landlady was presumably Mrs Alfrey (QV*). Charles Weichsel bach = St Martin in the Fields by lic botp 18.9.1804 Stefana Rovedino sp wits Antonio Mariotti, Carlo Antonio De Gricy (?)