Well, the nice man at Belarc came back with more information. Mr Badger has said much the same thing, but has put it even more clearly. Thanks Mr B.
I've split the post thread now, but I duplicate this statement in the other thread.
I'm only quoting, so it's yet to be confirmed. Words to the effect:
"Dell have relented, and are allowing customers the route to that Key."
It's my intention to prod Asus with this information in the hope of a change of policy. I will NOT travel the world without the key to my OS. Pity, I quite like my shard of metal.
I'll may well install the W8.1 MS subsidized to resolve this issue, and try to master an OS designed for girlies.

But I shouldn't have to.