First of all, it is not my employer causing an issue her it is my "fault".
Initially I was not going to take any Statutory Paternity Leave but my wife has recently changed her mind and said that she would like me to do so.
The problem is the baby is due in ten weeks on Friday and I should have informed them at least 15 weeks before the due day.
What I am my employer is now trying to work out is; is the 15 weeks an EMPLOYEE'S RIGHT, in which case it is not a problem and my employer has said they are fine with it. OR is it a DWP RESTRICTION? (In which case we have a problem).
Given your employers are understanding, it will be fine; if notice is late, its essentially up to them to decide whether you told them as soon as it was "reasonably practical". They could decide that you told them too late, but as they haven't, it's fine.