How to tell if someone is flirting with you:
Stroke and twirl – they preen for you by stroking their face, arms or legs, brushing their clothes or twirling their hair
Get the point – pointing a foot, knee, hand, arm or head in your direction
Check the mirror – copying your actions such as leaning forward or sipping their drink a few seconds after you do
Eye to eye contact – extended eye contact until you notice them and breaking off the gaze slowly
Flash some eyebrow – their eyebrows rise for about a fifth of a second after first seeing you (but blink and you’ll miss it!)