Constantin Roman advises me of the following record from the Alphabetical Index of Aliens in England, Denizations and Naturalisations (PRO, Chancery Lane, London), extract notes: 

GAUBERT Tatiana Nancy, uncertain nationality 28.6,.1934, Date of Oath 29.6.1934, Place of residence London, No of Certificate CZ106-G.123

In December 2004) I had a look at www.catalogue.nationalarchives.gov.uk. This showed that the UK government held a file at the National Archives at Kew on Tatyana Gaubert but that it would not be accessible to the public until 2035. The file number was HO 405/ 15848 re Gaubert T N date of birth Sept 1913 and related to the period Jan 01 1930 until Dec 31 1934. The prefix HO signified a record created or inherited by the Home Office. HO 405 further identified the file as concerning Aliens Department, Aliens personal files personal files, applications for naturalisation. The file was in English with a former reference department code of G 123. The closure criterion given said that the file contained sensitive personal information which would substantially distress or endanger a living person or his or her descendants.

I wrote to the National Archives and persauaded them to open the file and below is a copy of the correspondence that is now available for public viewing.

	see document left. The author of this report is Inspector Hubert Roylance Morse who was born in 1891 at Newland, Gloucestershire. Hubert was an accomplished linguist, speaking several languages fluently. He joined the police force in 1911. By 1915 he had the rank of Police Constable CID Commissioner's Office (aka Scotland Yard) and by 1930 he was at Special Branch, Scotland Yard In 1937 he became Detective Inspector Morse, now the title of a television detective series 'Inspector Morse'.