Whisky punch is served cold, while whisky toddy is always served hot.
Peel lemons finely, squeeze out juice, put peel and juice in large jug with sugar. Pour boiling water over, leave until cold. Strain into large bowl, add bottle of Scotch whisky, stirring well. Chill for at least 1 hour, serve. Toddy Peel circle of peel, about one inch wide from lemon.