Posted: 24/08/2015 at 18:07
Any fast growing tree is not going to stop at 3metres. How are the neighbours going to handle their oak when it wants to grow tall?
I suggest you make yourself a trellis screen up which you can grow climbing roses, clematis, honeysuckle. Another alternative would be a hedge on stilts which is basically pleached linden, hornbeam, beech (copper beech looks good) or even catalpa which you grow as bare stemmed specimens and train the upper branches horizontally to give a privacy screen.
Here's a picture of one seen at Chelsea a couple of years ago to give you the idea
You can underplant with all sorts of herbaceous perennials and bulbs for year round interest, keep your view and lose the shed.