In other words, they can't keep you from talking about computers, but they can always ask you to leave their store. That aside, unless you two were very loud, that's a pretty stupid reason for a businessman to kick out a customer.
I think it would also depend on the content of the conversation, If some customers were talking about the pros and cons the zx specturm version of manic miner, im sure the GW shop wouldnt have an issue, if however someone was vocally slagging off DOW2 in store you could understand them been asked to leave.
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