why does my iphone have contro centre spelled control center

Spelling will depend on display language. If your iPhone is set to US English it will be spelled as Center and not Centre.

Check Settings ➜ General ➜ Language & Region ➜ Preferred Languages and make sure English UK is set as the iPhone language there.

As I think Winston Churchill said, “America and England, two cultures divided by a common language” or words to that effect.

That’s how it’s spelled in US English

Winston Churchill quotes, even the ones he didn't actually say, are usually pretty spot on.

KiltedTim wrote:

That’s how it’s spelled in US English

Which, somewhat ironically, is the most commonly used form of English.