I thought the Iraqi government were your best buddies. I almost thought they may have a weaker version, but to have it that weak seems a bit much. Wasn't Chobham replaced with Dor(k)chester anyway? As for surviving an ATGM hit, depends on the angle and the ATGM I guess, I don't think they have lots of deleted Plutoniumham or so on the roof yet for example.
Either way, planes have plenty of ways to dispose of tanks, a 250 or 500kg steel container full of explosives also works as I mentioned, it's what they used a lot in Libya I assume since I vividly remember how the French and British ran out of the guided ones and couldn't attack tanks anymore because the unguided ones tend to miss moving targets too much I guess.
Mini nukes are more for taking out entire platoons or even whatever is above a platoon.
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