If anyone is choosing to use musicMagpie's 'smartdrop kiosk' - I'd heavily recommend being prepared for a complete farce. If you're from West Yorkshire - avoid the Morley ASDA store.
Took my 14 Pro to trade in about 1PM today, all checked fine and got to the 'accept' final screen. As soon as I clicked the big green button, it threw an 'out of service, please call this number if your phone is stuck' screen. 40 minute wait to get through, but when I did they ran some checks and confirmed the device was in the machine and would manually pay me. The machine promises same day payment, but I now have a 2 working day hold. Annoying, £560 in limbo.
I've returned to ASDA tonight assuming the above would be a one off to trade in my mum's 12 Mini, they're offering £185. First has an issue reading the IMEI so I clean the screen and wahey, we're off, all the checks are working and completed. Click accept again and it throws an error "Error accepting device" to which the machine starts to whirr away at me and again, refuse to spit my phone out. As I'd spoken on the phone earlier I knew ASDA could open the machine, so along comes the store manager who was fine, but confirmed he now can't give me my phone back as they'll be investigated for a missing phone by MM. So not only am I now without a 14 Pro and 12 Mini, I'm without the £560 + £185 they were valued at too.
I got email confirmation of the manual payment on my 14 Pro so I've followed up with my 2nd problem of the day. From the sounds of it, it's not too rare of an issue at that store. Clearly the machine is broken - so definitely avoid the Morley ASDA if you are looking at a 'SMARTdrop kiosk,' oh and the Dewsbury store also doesn't work, so don't try that one either.