The standard for this in the UK is that you should make a reasonable effort to work out who was driving.
e.g. checking your calendar/diary, looking through receipts or bank statements to work out where you likely were.
There's also a requirement that a request for information is sent within 14 days for minor incidents like speeding or red light violations, so it's not like you have to work out who was driving on a Tuesday morning three years ago.
That's a normal legal term in the UK: