my son is at boarding school in the UK (Swiss national) and will be able to start taking driving lessons in December. whilst i know you can transfer your driving license when relocating to CH within the first 12 months, i'm not clear on whether with him being swiss, he can take his test there, and then get it converted when he comes back full time in a few years?
He's been at school there for the last 3 years and has perhaps another 2 years to go...
No. If he’s registered as a Swiss resident, he can’t do his test in a different country. And I don’t think it’s worth losing Swiss residency for when Non-EU.
How can a C-permit holder be officially resident in Switzerland and out of the country for 12 consecutive months? Unless they put the C on hold - but they would still have de-registered.
I took my UK DL test last year after a year plus of pandemic delays. Apparently these delays/backlogs persist and getting driving instructors with availability, and test dates is quite tough. If you are thinking to do it in the UK I highly recommend arranging the written test ASAP and getting the instruction organised quickly. There are websites that can find you cancellation slots for the driving/ practical test that can help it go quicker but you really need to be over preparing in advance if that is the route you take.
Are you sure you're not misinterpreting the quote?
IMO "rechtlicher Wohnsitz" in CH refers to the time of conversion. The example documents make it clear that an actual change of residence incl. de/registration is at least the norm for the 12-month period abroad. Confirmation from the school/uni will apply where Swiss residency isn't part of the applicant's history, making it the next best thing.
That may work for OP's Swiss son despite still being a minor, the UK may see that differently (just a guess). But with a permit C I'd enquire ahead, making sure the permit can indeed be frozen and that there's no guardian necessary (or arrange for one).