Google casinos in your area and call them. Ask about blackjack and they will transfer you to the pit. The pit will tell you all the rules of the game except the penetration. Try to call during a time like Monday morning when they're not busy so they have time to answer your questions.
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99% of UK BJ games are csm or asms, so don't bother even considering visiting a casino here. There are (literally) a couple of tables that have hand shuffled games left, so you'd be better off going almost anywhere else !!