Hi again

I think that this is most likely to be the James Nicholson, husband of Christian. The age and location fit and we know that Christian was still sngle in 1881:
1881
Murton Farm House, Murton
RG1/ 5131/109/ 6
James Nicholson,head, unm, 40, Farmer of 1117 acres employing 21 lab, 13 women and 3 boys, b. Norham
Sarah Nicholson, sister, unm, 39, of no occupation, b.Norham
Ann Casey, serv, 22, domestic servant, b. Scrimerston
Mary Davidson, servant, 19, domestic servant, b. Tweedmouth
Gadget