Thanks to all for trying, but Thomas was still single in 1881, so not that pair.
I don't have a birth record for their child - I can't identify who it was. They may have had a child called Maggie J, born anywhere from 1886. She is 4 in 1891, but 11 in 1901.
My hunch is that she was Susannah Williams or Susannah Matthews, both bn in 1866. One of them marries in Ruthin dist and all I can find is an entry for a Thomas on the previous page - bit of a long shot. The other marries in Wrexham, but can't see any Hughes's.
Anyone out there with access to parish records for Fron/llangollen?