Hello Diane

The surname LUVATE does not exist in Italy today. However, the names LUVATTI and LUVETTI (using the phonetic pronunciation of you ancestor's surname) do exist in the Lombardia Region where the Province of Como is located.
Can you tell my why you stated that he arrived before 1823? Did something significant happen in 1823, or something that you can document to put him in England?
Found this Baptism in Lancashire, England for Charles Luvate in 1865.Name:
Charles Herbert LuvateGender: Male
Baptism/Christening Date:
17 Feb 1865Baptism/Christening Place: SAINT JOHN,PRESTON,LANCASHIRE
,ENGLANDBirth Date:
Birthplace:
Death Date:
Name Note:
Race:
Father's Name: Dominic LuvateFather's Birthplace:
Father's Age:
Mother's Name: Elizabeth JaneMother's Birthplace:
Mother's Age:
Indexing Project (Batch) Number: C00713-6
System Origin: England-ODM
Source Film Number: 93989, 93990
ALSO this marriage for Dominic Luvattic in 1823 
Groom's Name: Dominic
Luvattic
Groom's Birth Date:
Groom's Birthplace:
Groom's Age:
Bride's Name: Jane Railton
Bride's Birth Date:
Bride's Birthplace:
Bride's Age:
Marriage Date: 29 Sep 1823
Marriage Place: Saint John,Preston,Lancashire,England
Groom's Father's Name:
Groom's Mother's Name:
Bride's Father's Name:
Bride's Mother's Name:
Groom's Race:
Groom's Marital Status:
Groom's Previous Wife's Name:
Bride's Race:
Bride's Marital Status:
Bride's Previous Husband's Name:
Indexing Project (Batch) Number: M00713-2
System Origin: England-ODM
Source Film Number: 93993, 93994, 94006, 94012, 94013, 94014, 94015
I realize that the above information does not answer your question, but it provides reference for searching.

Here is some information about Italian migration to UK in 19th C.
http://www.anglo-italianfhs.org.uk/arti ... ration.htmAnd from this site:
http://wiki.ask.com/Italians_in_the_Uni ... m?oo=14222From Napoleon to WWI
Napoleon wars left northern Italy with a destroyed agricolture and consequently many farmers were forced to emigrate: a few thousands moved to the British isles in the first half of the nineteenth century.
From the 1820s to 1851...accounts for 4000 Italian immigrants in England, with 50% of them living in London. The regional origins of most were the valleys around Como, and Lucca. The people from Como were skilled artisans, making barometers and other precision instruments. People from Lucca specialized in plaster figure making.By the 1870s the main regional origins of Italian emigration to Britain were the valleys of Parma in the north, and the Liri valley, half way between Rome and Naples. A railway network had been started by this time and this helped the people from the Liri valley to migrate to the North of Italy, and then on to Britain.
T.