EASA ATPL exams taken in the UK prior to 31/12/20 remain valid for the issue of an EASA licence for 7 years from the last validity date of an EASAIR entered in the licence. (The last possible validity date being 31/12/20)
If your last UK IR expired more than 7 years ago, or you never took the EASA exams at all (grandfathered in from JAR or Pre-JAR) then you'll have to take all 14.