Craig Maxwell-Keys won't be an international referee

He is taking up a civil service post, and so will go part-time as a referee. He talks about in on The Rugby Paper podcast:

https://www.therugbypaper.co.uk/latest-news/355879/the-rugby-paper-podcast-episode-twelve-with-craig-maxwell-keys/

He was talking about moving up to the international circuit only recently, and did run the touch in Rome, so was on the radar. This is a decision he's clearly just taken over the last few months.

His officiating career isn't over, though as his part-time status means he will be available for Premiership fixtures. However, he was the youngest referee to a hundred professional matches, which means the RFU probably had hopes he would continue his development, and maybe get a decent number of Tests out of him.