Posted: 19/10/2014 at 17:33
Your school or college should be able to offer you some career guidance even if only to point you in the right direction. A good Horticultural/Land Based Studies College may be something to look at too.
It may also be worth trying to find Garden Designers/Landscape Gardeners local enough to you and seeing whether they would be willing to offer you some experience whilst you are still doing your A levels. Plenty of garden centres/nurseries also undertake design and landscape work and may be willing to offer you some practical experience. Doing odd gardening jobs for friends and neighbours would also give you some experience ( and hopefully some good recommendations ) to put on your CV.
You don't say how long you have been "into" practical gardening but I imagine you are fully aware that a good knowledge of plants is essential for your chosen career. Sadly, there seem to be a good many "Garden Designers" these days who consider actual living plants to be incidental to their designs. You sound far too sensible to fall into that trap tho.
Good luck with your ambitions and hope to see you at Chelsea one day