UK fluid ounces
UK fluid ounces are used in the United Kingdom for measuring liquids. One UK fluid ounce is about 28.41 milliliters. It is important to note that UK fluid ounces differ slightly from US fluid ounces, with one UK fluid ounce being equal to 1.04 US fluid ounces.
Teaspoon
There is more than one type of teaspoon:
A US teaspoon is 4.93ml: US teaspoon
A UK teaspoon is 5ml: UK teaspoon