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If you let the estate agent list it as a two bed knowing full well the loft wasn't a 'real' second bedroom without raising it, then you can jog on. If you said something and the agent did it anyway and told you not to worry about it I'd kick off.
My opinion of EAs is about as low as it gets but they're usually good on this as it's just a waste of everyone's time as it will definitely be found out.
If you're the buyer then you can kick off with the EA but I don't know what good it'll do, that's why you searches etc.
Yes, well established rule.
The soliton should have discovered and highlighted this discrepancy to the purchaser.