2,250 rev rattle is gone!
After trying for ages to find this increasing rattle, by using some rubber hose to my ear to drown out the d2 din I found the culprit!
Steve was right it was the rectangular counterweight attached to the handbrake drum was loose, and with the engine idling i tightened the 15mm bolt and blissful silence.
I had previously looked at the turbo guard, bell housing steel plates, diff ends steel brake plates and did a full inspection but the 25mm rubber hose found the culprit.
:)