The idea
Repeal ALL laws that have not been used in court in the last 25 years.
Why is it important?
Frees up the statute book and means that all our laws are relatively modern and relate to the world as it is now. If it has not been used for 25 yeras then it must by definition be Obsolete.
Also stops people using an obscure law out of context in a modern day setting that the law makers of the time could never have imagined and that the law was not designed to cover.