Since the Acton museum depot is open this weekend, 21469/470 is visible from the depot.
Go through the museum depot shed, all the way to the end, where you exit the shed into the outdoors. 21469/470 is visible heavily graffitied on the left behind a fence.
The above was the case on Friday 6/6/25. Potentially, there might be other S stocks parked between 21469/470 and the museum over the weekend.
At the same time, if anyone wants to see 09TS 036/035, it's now parked on Northumberland Park depot 25 road. It's visible from passing WAML trains. You can see just the front, with missing M-door and missing red shields to the left and right of the coupler.