Sky's FTTP setup instructions here suggest otherwise:
Cheers for that.
Perhaps they have amended their ordering system since the initial soft launch.
There's been a couple posts on the Sky forums and even a thread on here where attempts to activate a new Sky FTTP service on Port 2 resulted in Sky trying to take over/migrate the existing Port 1 service.
CarlT was 1 of those who tried and failed to get Sky to provision on any port other than port 1.
Sky tried to take over Port 1 which was in use by BT.
After a bit of back and forth I believe Sky gave up, conceding they couldn't do it.
As mentioned in my previous post the only limitation/difference I'm aware of between Port 1 and any other port on a 4 port ONT is that only Port 1 can be used for Multicast services.
Could be that Sky's internal FTTP ordering system didn't (or still doesn't) cater for a 4 port ONT.
In that case they can manually place the order to bypass that limitation.
Would be good to get confirmation from a Sky user that they have successfully activated FTTP on any port other than port 1 of a 4 port ONT.
I haven't seen any such posts on the Sky forum (yet), though I haven't looked there much recently.