Does anyone know anything about gardening?

I have done this with a Gala apple. So far the tree is alive after 3 years but suffering from rust every year. So I doubt I get fruit but willing to try.

Fruit trees are grafted on rootstock and many commercial ones aren't very hardy.

So worth trying but don't expect too much :)

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