Fair point. I'm am so used to the statutory days paid provision as separate and extra from how many days holiday we get - Xmas, Boxing Day, Easter, August Bank Holiday etc.
So we always built around 9 day or 16 day breaks, and everyone else seems to. There's usually a few holiday days left over for the odd day off. Some places didn't even count the compassionate things or family emergencies towards holiday entitlement days. Heck, when I was contracting, we took a few - obviously unpaid - one month holidays!