A friend at work's daughter has gone and bought an 02 plate VW Polo 1.2 (60k on clock). However after having it delivered after driving it she's noticed the oil pressure light come on but only when the car is crawling / going slow. When going normal speed / fast the light stays off. The light is illuminating red when coming on. Could this be a dodgy oil pump? Anything else it could be?

Cheers!