I picked up this pair today whilst on a trip to Cardiff with her indoors. She went and bought some clothes and met up with friends, I looked at militaria.
The pair is still in its original box, and the medals show almost no wear with the BWM being quite tarnished but still shiny (sadly the pics of it do not capture how fine the condition is) and the VM is in nearly perfect condition. As is not uncommonly seen, the medals have the ribbons on the wrong medals, they came unmounted to the recipient and it is obvious that this mistake was done back in the day.
His full name is Thomas John Williams and his short first number suggests he might have been an old soldier or perhaps was a Terrier. He then served with the 6th Glamorgan Battailon which became the pioneer Bn with the First division in France in 1916 and later he served with the 4th TF Bn, probably at wars end before being demobbed, though he might have continued with the Terriers for many years after, especially if he had been a TF before the war.