McCarthy and Jaques marriage date?

[worth]

I am looking for the above marriage please, but i cant seem to find anything.
According to the 1881 UK census John Mccarthy was born about 1849 in Ireland, he was living in Sheffield aged 28 with his 'wife' Sarah J Mccarthy born in Grantham Lincolnshire, aged 26 and their 2 children, John T Mccarthy aged 3 and Walter Mccarthy aged 1, also in the house is a border called Henry Parkin aged 26 and Sarahs mother, Rebecca Jaques , widow aged 64.
Im guessing from the oldest childs birth that John and Sarah would have been married around 1878 but i cant find anything. On the 1891 UK census, Sarah has changed her first name to Mary J Mccarthy aged 36. Sarah Mccarthy died in 1895 aged 41 in Sheffield, John died in 1908 Sheffield. Could you nice people see if you can find a marriage for me please, as im going around in circles and getting nowhere.
Thankyou in advance.

[BumbleB]

Apologies but I think you have misread the 1881 census entry for the household. 

Rebecca Jacques is aged 64, a widow and Boarder.

There is no indication that she is Sarah's mother. 

ADDED:

Just checked GRO for the two children - Walter shown as McCarty, John Thomas as Macarty with mmn = Jaques in both cases.

[amondg]

GRO Index

John Thomas McCarthy registered Sheffield 1878 mmn Jaques

Walter McCarthy registered Sheffield 1880 mmn Jaques

[amondg]

Walter was baptized at cathedral Church St. Marie Sheffield on 21 March 1882

parents John McCarthy and Sarah Jane Jakes (sic)

[BumbleB]

And another child baptised at the same RC church in 1883

Georgius Walter, born 9 August, baptised 19 December 1883.  Johannis McCarthy and Sarah Johanna Jakes.

ADDED:  Doesn't seem to help with the marriage, though. 

[worth]

Thanks for the help you guys, their first son John T Mccarthy born in 1878 was transcribed as Macarty, ive just come acrooss him x

[BumbleB]

Image for Georgius Walter's baptism

[BumbleB]

1891 - RG12/3822 folio 24, page 2

John - 42, Mary Jane - 36, John Thomas - 12, Jane - 3 and George 7.

Registration - 1888 - Sheffield - Jane McCarter, mmn = Jacques

[worth]

Thanks for that BumbleB, i hadnt come across this, just the transcription. Do you think its possible the parents werent married, just a possibility thats all x