Fast growing screening plants for a north facing Cornish garden?

[MiracleQuestion]

Our garden is very close to the sea and faces north. We have a very ugly 5ft wall enclosing all sides.We cant drill into it etc.

I really need something evergreen, fast growing and good for screening to plant along the walls to give more privacy and hide the walls.Something that will grow to at least 6ft ideally.

Can anyone advise please?

Desperate bump

Griselinia is supposed to be tough for seaside gardens. I think there's a variegated version which might be more interesting than plain green. Some types of Olearia (New Zealand Holly) might be suitable too. Escallonia also.

Thanks for the suggestion aircooled. I feel worried about planting something that might cause problems with roots but I need it to grow large and quickly. I'll check out your ideas.

Anyone else help?

Viburnum tinea is evergreen and grows quickly

Grissilinia has grown so well in our sea facing garden (south facing) - after a few years of putting in tiny plants, we have a 1.2 m hedge, I'd say. (Can check!!)

Apologies OP, it's viburnum tinus. It's quite a dense shrub so will screen the wall very well but it's speed of growth may not be fast enough for you? Regarding escallonia, the bees love it when it's in flower so if you want to sit close by it this may be a consideration.
maybe you could also plant a very fast growing climber and cut it back when the hedge gets to a good height?
can you paint the wall To make it less ugly?
I am growing bamboo in pots as a privacy screen , I am too frightened to put it in the ground (see all the threads on removing bamboo) as I am not confident to identify it as a friend gave it to me.

OP if you google
Fast growing screening hedge UK

You will be directed to the RHS website with information on what to consider when choosing screening plants and there are suggestions there on what to plant.

Why not take a walk around your local area and look at the hedges there to see what is growing well? If you do not recognise the plant you could take a photo on your phone and show it to one of the staff at your local plant nursery and ask for advice.
Also when I mentioned painting one wall I was thinking of a trompe d'oeil (can't do the spelling?) with a feature scene that draws your eye in and away from the other walls. Sometimes distraction can work better than screening?
Or maybe having other features in the garden that draw your eye away?

Does the actual wall face north? How shady is it in practice? This makes a difference.

Nice wall shrubs include cotoneaster, winter jasmine, ivy (eg the large leaved dentata or gloire de Marengo.