Hi Steve, 
This seems a long shot as I don't have much info but here goes. 
Am looking for a John Guarnieri/Guinari/Guarniere. He came over from Italy to London sometime between 1851 - 1861, he then moved to Manchester in England with his wife and family. 
Here he is in 1861 as a musician 
Name:   John Guarniere
Age:   28
Estimated birth year:   1833
Relation:   Boarder
Gender:   Male
Where born:   Italy
Civil Parish:   Holborn St Andrew
County/Island:   Middlesex
Country:   England
Street address:
Occupation:
Condition as to marriage:   
.
Registration district:   Holborn
Sub-registration district:   St Andrew Eastern
ED, institution, or vessel:   5
Neighbors:   View others on page 
Household schedule number:   62
Piece:   185
Folio:   105
Page Number:   10
Household Members:   
Name   Age
Louis Bassino   40
Angel Briank   35
Petro Masochi   30
John Insano   28
Bernardo Armack   35
Gaspar Bassine   32
Joseph Bassino   12
Louis Scartazza   53
John Meske   43
John Guarniere   28
Dominque Lurlin   22
Dominque Masochi   15
Antoine Briante   46
John Cassali   42
Dominque Bellini   18
and here he is in 1881 (After this we believe he left his family and went to Ireland and no one heard from him again) 
Name:   John Guinari
Age:   49
Estimated birth year:   abt 1832
Relationship to Head:   Head
Spouse:   Ellen Guinari
Gender:   Male
Where born:   (F), Italy
Civil Parish:   Manchester
County/Island:   Lancashire
Country:   England
Street address:   6 Chapel Court
Marital Status:   Married
Education:
Employment status:   
.
Occupation:   Street Musician
Registration district:   Manchester
Sub registration district:   Ancoats
ED, institution, or vessel:   5
Neighbors:   View others on page 
Piece:   3978
Folio:   75
Page Number:   22
Household Members:   
Name   Age
John Guinari   49
Ellen Guinari   36
Rosina Guinari   9
Antonio Guinari   7
(not transcribed)    
Jane Green   26
James Green   2
If you're able to maybe shed some light on the Surname and it's origins, or even anything about John (unsure what the Italian for John is) that would be excellent! A great thing you're doing here offering your help to people! 
Keelan 
Update - Just been given this bit of info by a member on here 
Marriage 
June 30th 1868 Manchester Cathedral
Johannes Gavaneri 39 yrs bachelor Organ player  father Dominii Gavaneri, gardener
Ellen Rock, 34 yrs, widow.  Father Alexander Smith, Labourer.
Witnesses Vincent and Elizabeth Garibatti