I noticed this comment "Make sure you don't enter via Ireland."Why?
I ask because what would be the situation if, because it's more personally convenient, the person coming to the UK for the first time on a spouse visa travels here NOT directly from their home country. But by changing flights in a nearby country.
I have in mind the situation where the person using a spouse visa lives in one country, from where they received the spouse visa and which they are a national of. And not in the EU/EEA.
From their home country, they decide to fly to a nearby country which is in the EU. From there, they then catch a second flight to an airport in the UK. Not necessarily to the nearest airport to where the sponsor lives. But one where the second flight happens to fly to.
Is this arrangement fine with UKVI? In other words, it is not the case that the former applicant, now armed with the spouse visa, has to fly directly (given a layover) from their home country to the specific UK airport that is nearest to where the UK sponsor lives?
Or is the person using the spouse visa free to travel to the UK (within the 30 days allowed) by any air routes? And whether the routes used are inside the EU or outside the EU is not relevant. (Except by using an Irish airport.)