please advise me has to what tree would be suitable for me

[TRE]

Hi,
Could some one please advise me has to what tree would be suitable for me at the end of my garden.
My garden size is 22 meters by 6 meters (width) and at the end of my garden is a council estate which is why I need these trees to block there view. I think I am going to need 2 or 3 trees for this but are unsure what type of trees to plant, could some one please advise me on this the tree should reach max about 10 meters high with roots that go down into the earth and NOT side ways as later I will be having rear kitchen extension put in I do not need the roots coursing subsidence also a point to notice is the soil is of clay type, I am quite like the ever green as they block all year round. A friend as said to me a fern tree is good?