North facing border

I''d suggest starting with climbers to cover the fence, and act as a backdrop. You may need to screw in eyelets and rig up horizontal wire supports at intervals up the height of the fence. Suitable climbers which come to mind right now, and which I have had experience with in the past are:- climbing hydrangea (Hydrangea petiolaris); climbing rose "Gloire de Dijon"; winter jasmine (Jasminum nudiflorum; Clematis montana (for quick coverage). I also once had success with a trained Morello cherry, which was quite productive. Cotoneaster also will do well and will train itself vertically without need for support, although it may well need quite frequent trimming to retain its "flat" appearance, so should be accessible for this purpose. Then, begin to think about the foreground and underplanting (another whole "ball-game). "Happy Planting" !! :-))

Under plant with yes youve guest it heucheras as long as it is well drained. Make the border bigger to it will look better I think and plant it with bushy shrubs such as viburnum plicatum 'lanarth' has flat plate like white flowers leaves get red autumn colour,which would hide a bit of what around the corner. Then give it hieght with a tree maybe Betula utillis 'Silver Shadow' fancy silver birch which is beautiful a real conversation piece with dazzling white stems
,- small to medium tree with striking white bark and large drooping dark green leaves
In fact an edge that has a curve would be even better, so that you cant see everything in one go.
it gives you a reason to wall around the garden.
Dont be afraid to use larger plants in small gardens just check how big they can get first and if you can prune them then you can contain them.
Clematis look good too grown on trellis cover roots with heucheras all round colour as they are evergreen.
Bulbs for in the spring and if you were to bark alittle around the plants you wouldnt have quite so much weeding and more time to wander with a glass of wine or cup of coffee :)

I love the suggestion of winter jasmine so fragrant:)

Thankyou both for your suggestions. Cant wait for spring now so that I can get started. Is there anything I could do in the greenhouse before then, I've never had one before, its only been up about 2 months?

Hi Arelee, welcome to Goy from another West Midlander:-) You are so lucky to have a greenhouse. It means you will be able to grow more tender plants as you can over-winter them there and start off seeds early etc. There are plenty of greenhouse pros on here (not me) and I would suggest you put a question on 'gardening questions' asking for advice, good luck:-)