Kerria - yellow flowers in spring
Tamarisk - pink flowers in spring
Azalea - pink/red/peach flowers
Mahonia - yellow flowers then blue berries
Japanese Anemone - loads of colours!
Most spring bulbs will do fine - so daffs, tulips, crocus and the like.

Thanks Kildermorie.

ferns will be quite happy as would hostas. there are lots of plants that like light shade. Aconites [tall 3ft] foxglves, lisymachia the white ones [or the rampant yellow ones] tellima, heuchera, heucherella etc.

scroll down and click on S so you can then go to shade plants.

Thanks people quite a few to be going on with there.

I think I might try hanging baskets above a long bed of Heucheras to bring all year round colour.

you have the option right now with such a wonderfull blank canvous of a garden you could re-design it and look at your options . doesnt have to be expensive rather than borders round the edge . you could cut a circle in the grass and do swirly shapes to lose the square look . nows definatly the time if you wanted to . you could have a round decking seamingly hanging over a round bed and a round seating area perhaps out the way . just a thaught .

Hardy fuchsias would be OK in a bed along there and give colour from mid July to first frosts. Dollar Princess is one of the showiest hardy ones and Beacon is good too. Doronicums (yellow daisies) flower in early spring and would be OK. Your climbing hydrangea will completely cover at least a third of your fence eventually. There are several climbing roses that will grow on a mainly shady fence. Snowdrops and daffodils would flourish (but probably not tulips)and there are very many hardy geraniums that like semi shade Look on line eg at Long Acre Plants as they specialise in plants for shade.
Winter colour: Eonymus fortunii - several varieties, variegated Green/white or gold/green, always neat and attractive and need hardly any attention, just clip to shape if necessary.
NP's idea of butting in some curves is brilliant.

Shux thanx steragram lol x x

Yes I agree curvy butts now there's a thought.
Mrs T might have something to say about that, I don't think I would be gardening for a while LOL.

Seriously as you can see from the new pic I have put on, the left hand side of the garden is quite shady. I have dug out a border approx 2" wide just for now to get me started. Cut diagonally across in front of the lilac tree.

Also planted about 10 Viburnum shrubs approx 2" apart
along the top of the garden, so they will eventually form a hedging border.

If you want to plant and walk away for a while and hide that developement at the back CAMELLIAS. Evergreen, certainly don't mind a bit of shade. Very little care apart from ericaceous fertiliser at intervals. Make sure soil not too alkaline and not too much morning sun. Easy....red white/yellow/pink/ double. An early one would flower in December and they would go through to May. They flower slowly over time, not in one go, like a lot of shrubs.

Dorjac, what you see at the back (development) are allotments.

I saw what I thought were allotments but the houses caught my eye....why not hide them?

Don't use Camellias if it gets the morning sun or the flowers will be scorched by Frosts. Try Garrya elliptica or Hydrangeas, or Bamboo ( a clump forming type). Or Pyracantha or variegated Hollies for winter berries.

Treetop and NP, butting was a typo - I meant putting!!

Hi Volunteer already said that in my entry, as it is standard issue when one plants Camellias. They can give colour over about 6/12 if one chooses carefully.