Sure, tons of 12" square tiles exist. Without more info though no one can offer more than that however.

I’m much relieved but searching the internet for a UK supplier hasn’t yielded much luck. They are to repair this floor — colour not critical.

I would hugely appreciate some help. Thank you.

This Houzz page is a US based page and most would have no clue on availability in the UK. Try the Houzz UK page.

I’d not appreciated there was a difference. Thank you. I’ll go looking.