UK motor insurance - job category

This is aimed mostly at UK based CF Investigators in Police / HTU type situations. When you insure your car or bike or whatever, what job category do you put down? With UK insurers the list is pretty limited, MoneySavingExpert has a full list here - I usually end up putting 'Forensic Scientist - Legal System' which is the least wrong option available.

Reason for asking is that I am aware that it can be tweaked within reason, so long as the man or woman on the Clapham Omnibus would agree that it's a reasonable interpretation of the actual job title, and lower premiums can be legally had.