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Pink Lady is a trademark for a company, not actually a variety of apple. But chances are its a Cripps Pink, which apparently won't fruit in the UK:
Cripps Pink requires a long, 200-day growth period and a hot climate, making them difficult to grow in more temperate latitudes
Plus as JWestland says, rootstock control things like growth rate, size, productivity, disease resistance etc at least as much if not more than the fruit variety. So basically if you actually want a good number of decent apples, buy a grafted tree. If you are just experimenting, why not
Growing this from a pink lady apple bought in a shop. Will this ever fruit?