Well done Carole- it certainly does look like Tonks.
I had looked for a marriage for Tonks-Trow and there was one on free bmd- 1848 I think. Mary Tonks and James Trow.
If you look at thsi 1851 entry, Mary is Mary Trow - a widow and is 30 yrs old and Ann is dittoed for surname.
I think you have found them
