IIP is, was and always will be utter b***cks.
Many an IIP consultant has grown fat on his/her fees whilst filling endless reams of garbage about some company or other that's needs the tick to win a public sector contract.
I was on the station team when IIP was initially introduced and I saw nothing in it that was not either common sense or stifling bureaucracy - and the RAF have been doing both those things well since 1918.
Years later I needed the tick for my company so I paid some dude two grand and two months later we were on the register with a plaque on wall.
Good riddance.