"Paul" wrote
I am starting a garden in a new build house, the main part of the
garden measures approx 11M deep X 17M long. This garden is in a windy
seaside location, I have currently laid the whole garden to lawn with
the intention of "carving it up" with some sort of design next spring.

Since the garden is flat and bounded by brick walls and fences I would
like to use plants to soften the these hard edges and give the garden
some height. As a start I would like to plant some standard trees this
autumn, (my wife likes apples).

Any suggestions as to what types of apple tree would be suitable for
my garden, what size should I buy and when should I plant my tree(s).

My late mother used to live 100yds from the S. coast, as Janet has said, you
need to get a book on seaside gardening as there are not many plants that
like or can tolerate the wind and salt spray. A lot of plants in Mums garden
used to get burnt every winter, and it wasn't frost. She did have an apple,
a Worcester I think, but it only grew well below the fence height, where it
was exposed to the wind off the sea it got badly damaged.
You are gardening in very special conditions, get a good book and become an
expert.

--
Regards
Bob
In Runnymede, 17 miles West of London