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Food Standards Agency - Eat well, be well - Milk and dairy

Children
Children should drink whole milk until they are at least two years old because they may not get as many calories as they need from semi-skimmed milk.

After the age of two, children can gradually move to semi-skimmed milk as a main drink, as long as they are eating well and getting plenty of calories and nutrients from a varied diet.

Don't give skimmed milk to children until they're at least five years old because it's too low in calories and contains only very small amounts of vitamin A, which children need.

Children between the ages of one and three need to have about 350mg of calcium a day. About 300ml full-fat milk (three fifths of a pint) would provide this.

Semi-skimmed or full fat milk?

After the age of five, provided a child is eating well and having a good, varied diet there is no reason why you shouldn't introduce semi-skimmed milk.

Until the teenage years it really remains a matter of personal choice – full fat milk would also be fine unless a child is overweight in which case semi-skimmed would be preferable.

Now Nanny bans the hard stuff - Telegraph

The only thing that whole milk hasn't got going for it is, of course, the fat. Fat content is relatively low - under four per cent for whole milk and 1.7 per cent for semi-skimmed milk - however it is saturated fat, which contributes to heart disease and fatness.

Paul Sacher, a child obesity expert at London's Great Ormond Street Hospital, broadly welcomes the ban, given that so many children are obese. But he adds: "The only children who may be affected are the five per cent who are under-weight and who need the extra fat. Unfortunately, they're a declining percentage of the population.

this quotes nothing to do with it but i wanted to add it anyway lol

Advertising experts agree that some of the best British adverts have been about milk. The Drinka Pinta Milka Day adverts of the 1950s were so successful it even coined a new word, "pinta", for the dictionary. They were followed by the Accrington Stanley boys, the dancing milk bottles, Linford Christie racing a milk cart and Paul Whitehouse's "Ain't milk brilliant" commercials.