"Fair Law" is the head start that is given to the hare before greyhounds are released. It's about 150 yards.

There has been some controversy over this in the coursing world over the last few years. The "law" has been getting longer and longer.

This year's Waterloo was won by Shashi.

This year's Waterloo will NOT be the last.

Mcgrath of harlow -- the rules given in your link are rather innaccurate. No points have been awarded for a kill for a few years.

The song describes how Master Mcgrath was beaten on the first part of the race. This is usually decisive. Only an exceptional dog could recover the lead and regain the points to win the overall race.

The song seems to confuse the "the law" with the first turn.