Help Knocking from behined dash

[Ska]

Hi
Not sure which section to put this in but trying to diagnose a knocking noise evident mostly below 30 mph, mostly around 1-10mph and nearly always when coming to a stand still or moving off. It sounds like its coming from behind the dash and can be felt through the steering. Checked out the suspension and track control arms - they seem fine, no play. Turn the steering side to side (both stationary and in motion) too but can't get it to repeat? Thought it was a worn steering U-joint. It sounds like some thing is loose and getting worse day by day with more and more knocking. PS I cant hear it outside the car??? Its driving me mad making me think something about to let go big time, any ideas?
'97 2.8sport (FWD)173k on the clock