Does your wife have any/many points?
If not then why not say she was driving on one occassion and you were driving on the other - that way you will only get three points, she will get three points.....assuming she is insured to use the vehicle.
marriage is all about sharing.... 
I've got a friend who is a magistrate in Birmingham. Not a workweek goes by that she doesn't hand out a conviction to someone for obstruction of justice for doing this very thing. Most times, it's a woman trying to get her partner/husband out of getting disqualified.
She's had people in there crying that they'll lose their job if they get convicted of obstructing justice or if they are disqualified and her answer is always the same: then you should have thought about that before lying/speeding anymore.
It's not like it's, 'Surprise! You're banned!'
Whenever someone's a ticket away from getting disqualified, and their car is flashed, it's something the police always check for - who was driving the car.
It's not hard to find out, either.
I really, really wouldn't recommend this.
