The real cause of injector rattle?

[JTaylor2005]

Haha fair enough. Well quick update. Having bought and fitted my new gates thermostat (83c opening temp) I drove to work today with took about 35 minutes. All the way it sat at pretty much spot on 90c on the gauge. Varied up and down on the gauge within the 90c white mark. I made sure I bled the system after warming it up as well so its all working corectly.
That is without the cardboard on the front by the way.

Also I noticed when fitting my old star that the rubber seal was slightly too small for the hole so the stat was slightly loose. This one fit nice and snug and tight as there was 3 to choose from with the gates stat so I picked the snug fitting one.