At least the ones on RS are likely to actually work properly.
That's if RS could send the right components.
Got some random 3 pin SMD thing in a bag that said LM2576T-05 G on it. Returned. Just waiting on a second delivery of the same thing.
Anyway. I got two things in the post.
Car 12V cigarette lighter socket with QC3.0 port 2x normal ports and a volt meter. The phone loves it, goes straight to 9V and pulls 1.5A. "Turbo Charge Connected". The voltmeter is handy as I'm running it off a lithium pack that is not protected.
and this little gizmo:
https://www.ebay.co.uk/itm/262407885292Which, asides the worrying green caps, seems to be fairly decent. I've only tested it to about 3A and it doesn't squeal, get warm or even sag voltage. It's holding 5.15V dead steady. The phone likes it, pulls 1.6A from it happily. I seems to have 3 ICs, one is about 20 pins, though I can't think what for as it's not QC. Also seems to have a shunt resistor, so maybe it's current limited. It's pretty too. From the ebay warning about devices not pulling 1A, they seem quite proud of it too.
EDIT: Actually this is reported as having 2xQC2.0 ports, which is why the phone is pulling high current. I can assume it only supports 5V though.
I think I can tick the USB charging box as DONE now.
I'm still going to build the buck converter, just for fun.