There are three Yudins born in Marylebone : Sonia in December Qtr 1909, Lily in Dec Qtr 1912, and Albert in June Qtr 1914. Mother's surname was Spevack. Check
www.freebmd.org No listings for any Yudavitchs born 1895-1915. But there was a Barnett Yudavitch born Whitechapel September Qtr 1891.