In 1855, Formes and Anschütz holidayed with Reményi in Jersey.Memoirs, 180-85. His second Covent Garden season included Fidelio (Rocco), with Jenny Bürde-Ney (1826–1886) and Tamberlik, and in the third (1852) was Weber's Jessonda and Formes's Mephisto in Spohr's Faust, with Ronconi, Bosio and Tamberlik.Memoirs, 122-24. Rossini's Guglielmo Tell was also given, and Tamberlik and Formes appeared as Peter the Great and General Romanoff in two sumptuous performances of Jullien's opera Pietro il Grande, which was a complete failure and ruined the composer.Memoirs, 124. In 1851 Karl Formes's brother, Theodor Formes (1826–1875), became a principal tenor at the Hofoper Berlin, where he sang the title roles in the first local performances of Tannhäuser (1856) and Lohengrin (1859). Theodor sang at Berlin until 1864.Brockhaus' Konversationslexikon (Committee of authors) (F. A. Brockhaus: Leipzig, Berlin und Vienna, 1894–1896) 14. Auflage, p. 981). The brothers Hubert and Wilhelm were also operatic singers.
