Which trees/Shrubs for privacy in small north facing garden?

BumbleBoo

Hi

My back garden is approx 7mtrs long x 12mtrs wide and is north facing

I'm in the process of designing. I'm very overlooked along the back fence and would like some trees/shrubs for privacy.

I'd ideally like 1 tree/Shrub to be evergreen in the far corner as that's where the privacy is needed the most.

I obviously don't want them to grow too high or wide due to the garden bot being huge. I'd also like them to give the garden colour/interest.

I'd like to know what are best to choose

Fairygirl

There are quite a lot which will work, so don't worry 
Mahonias, some Viburnums, Ilex [holly] , some Berberis, plain old Laurel, including Portuguese, Pittosporums Pieris, Rhododendron, Camellia, Skimmia,  - for evergreens. 
Your climate will dictate whether the Pittosporums will be hardy. All the others can take anything the weather chucks at them. Your soil will dictate whether the last four are suitable. They need neutral to acidic to thrive. 

Plantminded

Arbutus unedo is an interesting shrub that might suit you.  Known as the Strawberry Tree because of its red strawberry-like fruits, it is evergreen, happy in shade and can be kept as a shrub or allowed to grow into a small multi-stemmed tree: Arbutus unedo|strawberry tree/RHS Gardening. 

The fruits are preceded by clusters of delicate white flowers.  Once the fruits ripen, the blackbirds will be visiting your garden for a treat!  This would blend well with any of the shrubs suggested above by @Fairygirl. 

Try to find some room in your design for a Fatsia japonica also, it looks like it should be growing in the sun but it likes shade and will add architectural interest below your larger shrubs.  It is also evergreen.  Good luck and enjoy your gardening!