Cricket nets
Cricket nets were a practise area for cricketers. Like a batting cage in baseball, they gave players a place to hone their batting skills against a device which automatically bowled balls. Tegan Jovanka once had a converation with the Fifth Doctor in the nets at a cricket club in Tasmania. He claimed to have needed to brush up on his batting skills because his "eye wasn't quite in today". (MA: Goth Opera)
On another occasion, whilst on an extended stay with the men of the Stockbridge Cricket Club, he had a disagreement with Don, the team captain. Rather than let the argument continue, he left the pub, saying that he would see Don "in the nets" the next morning. This implied that the nets were a regular and ritualistic part of team life. (BFA: Autumn)