For completeness, here's what I've just dropped off at my local recycling centre. I did my level best to make sure I collected as much of the old red stuff as I could during my multiple flushes with de-ironised water, ensuring I could ethically dispose of all the wase coolant.
![[Linked Image]](https://i.ibb.co/QFCZN7xR/20251109-152836.jpg)
And here's what the header tank looks like after the final bleed and fill with Prestone concentrate, a successful job that's clear from the difference in colour beteeen the old and new coolant.
![[Linked Image]](https://i.ibb.co/qFyms7Lh/Had-Tank-After-Prestone-Coolant-Change.jpg)