Well I uninstalled the dishwasher (Yes I remembered to turn the water connection off).
I cleaned out the trap which was not at all the horror I thought it might be.
Intake and drain lines are both fine with no kinks or blockages.
A bit of water remained within the unit which conveniently spilled out when I flipped it on its side to undo the intake hose.
But it just won’t go, lights are on but nothing happens beyond a low noise like a semi-relieved constipated cat.
Thank you all for your help.
Back to shopping.
