Just place the stone into the soil ( pot or ground) pointed side up, cover with soil, water and wait. Once it breaks above and leafs out give it a bit of fertilizer.I think it takes two or three years for it to mature

But you still won't get any fruit in the UK!

I wouldn't have thought u would be able to grow them in UK
I love avocado, though!
Good luck anyway :)

My old optician had one up to the ceiling & I always got distracted before my eye tests.Lots of green