Marigold, you are so very welcome! You gave me a giggle when you said "Crikey!" I never knew how to spell it.
I'm really glad you mentioned the winter jasmine. This is what it looks like just to make sure we're talking about the same plant.
I'm thinking the privet is all green, the house is white, the front door sage green and the winter jasmine is yellow. With those colors you could add almost any color for contrast or to blend. Darker colors will recede and light colors will show better from a distance and in shady conditions. Therefore, yellows, white or light pinks would look good from the street and in the shade.
By the way, with the bed being 1 meter deep you could probably make it 2 plants deep. It would depend on what you select and the mature size they become.
If you want flowers you could use hostas and another flowering plant in front of or behind them, depending on the mature size of the hostas you choose. You could even make the entire bed hostas, but they aren't evergreen so you won't have anything to look at in winter. Hostas come in many different size plants, many different sized leaves and many color combinations. Some are variegated with either white, cream or yellow. There are tiny ones that can be enjoyed close up and large ones that can be a backdrop for other plants. They do bloom, but many people don't like the tall flower spikes and cut them off. With only 2 to 4 hours of sun there won't be too many plants to choose from with a long bloom time, but here's some ideas.
If you want to just look at lots of plants with a particular name you can click on 'Image's at google. It's best to use the botanical name if you have it as there are often many plants with the same common name. Here's lots of hostas and hosta combos to look at.
There are everblooming and reblooming daylilies and they come in different colors and heights. The more sun they get the more they will bloom. The Appster series are nice. We planted a slightly fragrant light yellow everbloomer called 'Big Time Happy' in my daughter's front garden. Just deadhead the spent blooms and cut down the spent flower stalks. Not much needed to keep them going. They bloom from the end of May until hard frost in my daughter's garden now that they've matured.
Another favorite of mine that we used in my daughter's front garden is a hardy geranium - Geranium 'Rozanne' that also blooms from May until hard frost. It's the longest blooming hardy geranium and was discovered in the UK. It can take part sun. In the second picture you can see it spilling onto a walk so plan carefully as it does get full in just a year.
Heuchera (coral bells) is a wonderful US native plant and now comes in an array of leaf colors that will boggle your mind! You can have all kinds of color combos and the hummingbirds like the flowers. You will also see Heucherella at the Terranova site. It's a cross between two US natives - Heuchera (coral bells) and Tiarella (foam flower). It's sterile and doesn't produce seeds and doesn't do well in less then pampered conditions. So don't even bother with them.
Another fun US native is Tiarella - foam flower. Lots of neat leaves on these too.
Bleeding heart in pink or white. My old fashioned ones bloom for a long time in a moist spot and form a lovely clump. In a dry spot they go dormant mid summer. They look nice with larger leaved hostas. There is a new smaller one called fern-leaf bleeding heart. The entire plant is smaller and blooms on and off all summer.
Hakonechloa looks great at the front of a bed. It's a grass, but so graceful and lovely. It comes in different shades of variegation and looks great with solid green hostas, purple leaved plants or large ferns behind it. It would need to be on the outer edge of the bed so it can drape over.
Epimedium might be evergreen where you live and comes in several colors of flowers and leaf shapes.
Berginia is a lovely evergreen groundcover that isn't invasive and has large shiny dark green leaves. It comes in white or pink flowers. I think there is a red one now too. I have the pink. It will tolerate dry shade once established.
Another plant that is evergreen and has a long bloom time in shade is Helleborus niger aka Christmas rose or Lenten rose. The flowers tend to nod and face down because they are often in bloom when there is snow and come in many different colors now. They were originally only in cream and green. They bloom for me in zone 7 from March to June. You are probably in zone 8 or 9.
Whatever you decide to plant I would suggest you only use 2 or 3 different plants so the area isn't too busy. Consider the leaf colors and shapes as well as he flower colors for those that don't have a long period of bloom. Leaves come in so many colors and shapes that they add dimension to the planting.
Next fall you could add spring bulbs and extend the bloom season. They will come up before the perennials. As the leaves die down, the emerging perennials will cover the the leaves from the bulbs. Take a look at the 'Bulb's section of that RHS site I gave you for ideas.
Don't hesitate to ask more questions. Let me know if you think you might like dwarf shrubs instead of perennials.