Nanny Beach said:
Welcome we only do kind words on here.
Climbers. That left hand fence is just asking to have climbers to extend the season of interest? As the fence posts are on our side that would indicate the fence is yours so you could easily fix vine eyes to the posts at 30cm interval and then tension wires between them. It's a cheap and unobtrusive way to provide support for a repeat flowering rambling rose such as Albéric Barbier (white) or Phyllis Bide (pink). There are plenty of climbing roses that would do too. Clematis would be another possibility to plant on its own or to mingle with the rose and I would advise a viticella as they are robust, come in many forms and colours and are easy to prune and care for once established. Betty Corning is a good one - http://clematisontheweb.org/new-clemdetail.cfm?dbkey=562 as is Black prince - http://clematisontheweb.org/new-clemdetail.cfm?dbkey=87or Hagelby Pink - http://clematisontheweb.org/new-clemdetail.cfm?dbkey=3206Etoile rose would be good at the sunnier end of the fence - http://clematisontheweb.org/new-clemdetail.cfm?dbkey=526 If you are allowed to attach supports such as wires, that wall at the bottom is asking for a lovely repeat flowering rose or a fan-trained blackberry or tayberry.Other than that there are loads of hardy geraniums, geums, astrantias that would cope with being north facing and give you a long season of flowering interest without swamping your dwarf conifers.
Pleasure. I love a good clematis tho I avoid the evergreens and montanas - too often thuggish and a short flowering season.You could probably twine a perfumed rambling rose around that arbour/seating area in the corner too. David Austin have some well perfumed, repeat flowering ramblers that would enjoy that spot. A white phlox, as @Songbird-1 suggests, will light up the more shaded areas, as will any white or cream flowered plant but you can go for stronger colours at the sunnier end.
'The power of accurate observation .... is commonly called cynicism by those that have not got it.
George Bernard Shaw'