First, never admit that you don't have room to keep wine, or worse, that you don't have the money to buy it. While ostentation is not respected, a certain appearance of financial credibility is desirable. Second, explain that you do have a private cellar but the thermostat is broken (to nods of agreement and sympathy). Third, explain that any of the following wines were 'all you could manage to lay your hands on'. When tasted, other budding snobs should immediately accept that you 'know your stuff'. In a nutshell: ditch the open fire and wing it.