I think “considered” is probably doing a lot of heavy lifting there. I’m pretty sure someone came up with it, maybe even Boris, and then he repeated it a bunch of times in front of semi-relevant people in a jokey-jokey way followed by an “…unless?”
I imagine nobody with any level of responsibility in actually producing such a raid considered anything apart from how to most politely say no to the prime minister.
I laughed more at this episode than just about anything else this year. Watching half a dozen lads driven fully demented by a man and his ten hour quest to shoot a horse. Truly magical.