Crikey! The previous cachers have had this for AGES, and have logged it in and out of caches of mine that couldn't possibly have held it. The mileage must be good.
Unfortunately, being in Scotland, it's not currently qualifying, but I've already dropped it off again.
By the way, I thought it was NRN IRN. I saw a car with that on it once and puzzled for a while until I read it out loud. Hey presto - I had the accent and everything! Given my dad was from Co. Down (but never had any discernible hint of the accent, apart from the word "Marthz" (Maths)), I always take an interest in such things.