rufvelo

I want to upgrade my old bike with a new frame. The older Shimano Ultegra 7/8 speed STI has worked well and I don't need anything else. Just want to replace the older Vitus 992 aluminum with a carbon or titanium frame.

The Qs I have concerns bottom bracket threading. I've seen mentions of 'English BB threading' in my frame search.

What does my Vitus/Ultegra have?
What threading do Colnago, Pinarello, Masi, Merckx etc have?
If this is an issue, do I just require a new bottom bracket or does it also impact the crank and possibly other components?

Thanks