Unit Definition (Teaspoon [UK])
The teaspoon is a unit of volume used in food recipes. In Britain, a traditional teaspoonful in the kitchen was equal to 1/8 Imperial fluid ounce or approximately 3.55 milliliters, but the medical teaspoonful was usually 5 milliliters.

Unit Definition (Tablespoon [UK])
The tablespoon is a unit of volume used in food recipes. In Britain, traditional tablespoons varied somewhat in size, and various older references give sizes in the range from 1/2 to 5/8 Imperial fluid ounce (14.2-17.6 milliliters). The traditional British tablespoonful was often equal to 4 teaspoonfuls or 1/10 teacupful.