Possibly, but no longer. Sadly there is still a clicking. I've systematically taken parts off and the click remains:
Undone stem and headset pretensioner and removed - click still present when pressing frame with foot at the bb.
Removed seat post and clamp - sane test, same click
Removed pedals - same test, same click
Removed cranks - same test, same click
Removed bb - same test, same click
The click can sound as though it's coming from different places, sometimes towards the headset, middle of the frame or bb area.
Whilst I had the spanners out I thought I'd fit a bottle cage. Discovered that one of the riv-nuts spins in the frame which is annoying as the bolt was already in there so I can't get it out, but it got me thinking. Could this be the source of the click?? It's still pretty tight, so not free spinning, and perhaps when the frame is stresses via pedalling or pushing the bb, the down tube is twisting ever so slightly, and as the riv-nut is not fixed in place, is clicking/creaking?
Any way I can a) confirm this as the source and b) get the thing out and replaced??
Pretty sure that the frame is solid aside from that, inspected the welds and tubes pretty closely and can't see any failures at the welds or any other damage.