OK I have tried my monitor at different Hz rates to see if the problem lay there but it didn't.
I have already tried disconnecting and connecting my power cables and reconnecting them, again not the issue.
My power cables to the GPU are a direct source from the PSU.
I tried your suggestion of using DDU and sadly that has not cured the issue!!.
I would welcome any other suggestions, this small single vertical line that pops up at random places around the screen does not do so on my desktop screen, only on open web pages