Quite by accident the other day when looking for something else I found a very similar signature, and my piece seems to be from the time Marie Hjorth and her sister Ulla Hjorth who took over the running of the L.Hjorth Pottery on Bornholm in 1982 until its closure, after the death of their father Erik. (although it could be earlier)
Thanks Karen to finding the potter, who was Malene Roge at L.Hjorth, from the same website that I was looking at, but couldn't see the wood for the trees!
Marie and Ulla Hjorth continued to work with Studio pottery as well as tableware after the closure of Hjorth Pottery. I found some of Marie Hjorth's work on THIS site, where the two images below are from:
You can also find a number of examples of Marie and Ulla's work on the Danish Art Pottery site HERE where the following two examples of Ulla's work are from: