Yes, but in this case the car is identifiable and so the registered keeper gets 6 points and a v large fine for failure to disclose whereas accepting the speeding fine results in 3 points and a smaller fine. Just saying nothing is a really bad idea.
The registered keeper is required to know who is driving the car and when so, unless there is a really compelling reason not to know (eg stolen car), then the keeper is guilty of "failure to disclose" which is 6 points and a big fine.
It doesn't matter if you are failing to disclose because you...
This is very poor advice.
It might have worked in OzMike's case as it was a hire vehicle and depending on when it was the law might have been different - the law has recently been tightened up to avoid this sort of thing. When you are the registered keeper you are responsible for knowing who...