Should UK Millionaire receives any changes in the future?

I think the gameplay itself is good as it is right now. No need to change that - 15 questions, 4 lifelines with ATH proving to be either useful or funny, or sometimes both, and the custom milestone is handy as well.

The classic soundtrack also works; no, I don't think it's outdated. It's probably objectively better than the rave soundtrack anyway. Plus it works better with the current set.

The set, however could use some modifications. It gets too dark too early, and practically remains so. There isn't much of an element of tension building as the time goes on, it's just always dark. Classic moving heads and extra audience lighting could do the job, though, and allow the progression from light to dark as the game moves forward.

The logo graphics used on set are good, using the rave background is fine, although personally I'd use the animation from the "Win £64,000/£125,000" segment for it. The lozenges have a very "2000 Germany" feel. I got used to them by now, but I'd rather something nicer. In fact, I think the international graphics are better in that respect. I'd like to see win graphics too, but Damian O'Neill & co. are doing a fabulous job at hiding them from us.

Overall, I think a few tweaks could make the revival go from very good to amazing. They aren't, however, necessary, and as we saw already, the show is pulling in solid numbers.