On the marriage document St Marks Church Islington it gives Benjamin aged 20 years - bachelor - labourer - father Giles Bennett - Rope Maker.
Just a thought - There are Giles Bennett, rope makers in Devon ? One example below ?
1841 Before birth of Benjamin - Cullompton, Devon
HO107 Piece 225 Book: 8 
Giles Bennett   40
Harriett Bennett   35
Henry Bennett   20
James Bennett   75
Emma Bennett   10
John Bennett   8
Daniel Bennett   6
Kezias Bennett   5
1851 Cullompton, Devon
Harriet Bennett Age 50. widow. roper. 
John Bennett Age 22. pauper. Crippled.
Daniel Bennett  Age 19. carpenter.
Kezia Bennett  Age 16 
Benjamin Bennett  Age 9
Thomas Casling aged 20. workman. ropers labourer.
https://www.familysearch.org/ark:/61903/1:1:SGJZ-M31Father would have been deceased at time of marriage  

Giles Bennett - Registration Quarter Oct-Nov-Dec
Death Registration Place Tiverton, Devonshire.
Death Date Dec 1849 - Volume 10 - Page 212
Sandra