Hi there,
1 tablespoon = 3 teaspoons
1 teaspoon = 5ml
1 tablespoon = 15ml (3 teaspoons)
2 to 2.5 teaspoons is a sensible measure for a "dessert spoon" (and mostly its quoted as 2 teaspoons) = 10ml.
Hope this help's or you could by a measuring set of spoons... 50p from Wilkinsons