The National Archives research guides will give you information on 'naturalization' records.
http://www.nationalarchives.gov.uk/catalogue/researchguidesindex.aspSome of these are indexed and in the online catalogue which I have already searched and did not find much for Vistirin.
http://www.nationalarchives.gov.uk/catalogue/default.aspI also searched documents online - the online National archives documents
http://www.nationalarchives.gov.uk/documentsonline/I have given you the Vistirin will information from there.
Other marriages
1797
St George Hanover Square Westminster
Vistirin John B
Mary M C Couvelair
Faculty Office Marriage licence
29 Aug 1797 VISTIRIN J Bap't COUVELAIR Mmc
(a copy of the licence can be ordered online from the British Origins website)
http://www.britishorigins.com/#collections1815 St George Bloomsbury
Rosalina Vistirin
James Robinson
1820
St George Hanover Square Westminster
Vistirin Jemima
Joseph Kitching
Vicar General marriage licence
05 Feb 1820 KITCHIN VISTIRIN
1822 St Paul Covent Garden
Theresa Vistirine
James Robinson
1825 St. Marylebone
Cornelius Vistirin
Ann Lamkin
There is certainly another Vistirin family on the 1841 and 1851 censuses in London whose father was also called Henry who was a shoemaker.
The Times 13th September 1815
Middlesex Sessions Sept 12th
The King V Michael Vistirin
This was an indictment against the defendant, a truss-maker and repairer of human defects, late of New Bond-street, for an assault upon Lieutenant Colonel West, Deputy Governor Landguard Fort, and stood for trial today.
Mr Dowling, as Counsel for the defendant, moved to postpone his trial till next Sessions upon an affidavit stating that the defendant was unable, from severe illness, to take his trial during the present Sessions.
Mr Knapp resisted the application, but The Court aquieseed in the motion, and the case accordingly stands over till next Sessions.
http://www.huguenotsociety.org.uk/family/The society will be able to tell you whether there is any evidence Vistirin is a Huguenot surname. Other than the late C18th marriage I can see no evidence of anything much earlier. The Huguenots main exit from France was after the Revocation of the Edict of Nantes in 1685.
Regards
Valda