NIP

[rustyrider]

Here it is, section 87 of the Road Traffic Regulation Act 1984 (Google it as I can't copy and paste into here?).  You would need to go to court which, at over a ton you are likely to have to do anyway (as I doubt you will get the option of the conditional offer of 3 points and £60), and explain the reasons why you were exceeding the limit and quote that section of the Act.  Something from a doctor to back up your wife's condition would be needed too otherwise everyone would try to use the fact that they were bursting for a piss as a defence.