So, what do we learn from this study?

That we haven't already figured out by observation?

He analysed drinkers' body language and then advised on their openness to being approached.

He has categorised them as the 'Flirt', 'Gossip', 'Fun-Lover', 'Wallflower', 'Ice Queen', 'Playboy', 'Jack the Lad' and 'Browbeater'.

1. The Flirt: Usually a woman, who holds her glass with dainty, splayed fingers and uses it in a provocative way. She may position it over her cleavage so as to draw attention to her attributes or peer over the rim to make eye contact when taking a sip. She may "tease" the rim of the glass with her finger, perhaps dipping it into the drink and sucking it dry. Assuming her agenda is appealing, the best way to approach is with reciprocal flirtatious gestures.

8. The Browbeater: This rather pugnacious type is again mostly male. He prefers large glasses, or bottles, which he uses as symbolic weapons, firmly grasped, and gesticulating in a threatening, "in the face" kind of way. Something of a know-it-all, he comes across as slightly hostile, even if only through verbal argument, or jokes targeted at others. He should be approached with great care, or not at all.

Celebrities: John Prescott, Russell Crowe (with Naomi Campbell as a female equivalent), Gordon Brown.