Hi, I know I've been doing this a bit lately...

, and this one might be a big ask, but here goes.
I'm after a lookup for Thomas Robinson, b. 1843 in Leek, Staffs. He married Sarah (surname?), b. 1844 in Manchester.
OK, that's what I
know, here's what I
think, but can't prove: Sarah Ann Harrison, married in Manchester in Dec, 1870
I know all the children's names, Maud, Ellen, Minnie, and Sarah, but not birth dates (just years). I think I can find them out but what I'd really like to know is marriage details, Sarah's maiden name and also some details on both their parents.
Is that too hard without her maiden name or does that just make it more of a challenge and therefore more fun?

If anyone can (wants to try) shed a little light here it would be very much appreciated by this antipodean
very amateur researcher!