compulsory insurance of aircraft weighing over 500kg against hijack

It is a legal requirement to insure all aircraft over 500kg in weight against hijack and terrorism;  this includes single seat gliders!  Although the risk of hijack of a single seat glider must approximate to zero, the average premium is about £175 per year on top of the usual insurance for airframe and third party.  This is nonsense.  I understand the legislation was supposed to be aircraft over 5000 kg ( five THOUSAND ) not 500kg. but the error will not be rectified.

Why is this idea important?

It is a legal requirement to insure all aircraft over 500kg in weight against hijack and terrorism;  this includes single seat gliders!  Although the risk of hijack of a single seat glider must approximate to zero, the average premium is about £175 per year on top of the usual insurance for airframe and third party.  This is nonsense.  I understand the legislation was supposed to be aircraft over 5000 kg ( five THOUSAND ) not 500kg. but the error will not be rectified.