Bit harsh fire wall, unless you and LTN man have some hidden agenda we don't know about. It seemed to me he was just pointing out that a Cat 3B equipped aircraft would be more suited to LTN (with it's propensity to fog out)than a Cat 3A, then you could accept 75m RVR and 0 DH. Don't understand where tyres come in to the equation. Oh, and I hope you're not this aggressive when you're flying.