Re: Ascension
Ascension is technically a spaceport already, at least notionally. It was designated as a potential landing site for the Space Shuttle, back when that was still a thing.
True, but notional as you say. It was an emergency/contingency landing site, which just means the Americans built a Shuttle-capable runway (longer, reinforced, capable of supporting both a Shuttle landing and the Shuttle Carrier 747 taking off again with the shuttle piggy-backing).
Presumably they had some equipment for safing the shuttle as far as fuel and hypergolics went, but it is just a glorified airport. There's no payload integration, fuel-handling or vertical launch facilities.
Equally, it wouldn't be prohibitive to build such facilities - SpaceX have shown it's quite possible to run a fairly "bare pad" set-up, without massive/expensive Service Structures and the like. Unless we want to lift multiple tonnes or get to GEO though, small-sat launchers from Scotland could quite happily put little sneaky-beaky spy sats or the forthcoming LEO comm sats into polar orbits. It's a niche, but a growing one - if Skyrora can make something stick and beat out enough of the other 100+ smallsat launcher start-ups all fighting for a piece of the pie.