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Your best option would be Elaeagnus ebbingei. Avoid Escallonia...
Aucuba? http://www.telegraph.co.uk/gardening/6246030/How-to-grow-Japanese-l...
I'd be tempted to use the native gorse, ulex europeaus, would visually fit with a coastal location, and should thrive there... or if to coarse for their tastes why not try broom - either the native variety, cytisus scorparius or one of the spanish cultivars, spartium var. While these aren't strictly evergreen, they should still provide significant screening with their green stems. These are all likely to tolerate some degree of shade, But like Ben said Eleagnus ebbingei would be a good bet too, fantastic autumn scent too, although the variegated forms are pretty revolting IMHO. Garrya eliptica might also be an option.
Are you talking a hedge or just various planting?
Escallonia would be a common seaside choice as would griselinia and of those two griselinia is significantly faster growing. Escallonia in my experience suffer a bit from windburn and dropping leaves making them semi evergreen.
Any hedge or planting will need careful watering and especially feeding until established because nutrients just leach straight through a seaside soil.
Prunus laurocerasus, Grisselinia litoralis, Ilex, Aucuba japonica 'Variegata', etc.
Some of the suggestions below might be inclined to grow too big. And variegated aucuba is mostly horrible! Gorse a good idea - won't get trespassing!
Some good suggestions. I too would favour gorse but another good robust plant (flowers too) is Tamarisk.
http://www.telegraph.co.uk/gardening/3336193/How-to-grow-tamarix.html
Aucuba are well behaved but slow if you want to get to 6ft. Might be good on the 'garden side' of something else to turn the planting into a border rather than a hedge? Ulex is equally good, and as suggested will certainly put off trespassers... could I suggest U. e. 'Flore Pleno'? Looks like ordinary gorse from 10ft+ away, but the double flowers don't set seed.
Griselinia littoralis is popular down here in Cornwall; the cv. 'Green Horizon' is a superb darker green version of the usually apple-green leaved species. I'd recommend it over Prunus laurocerassus any day for very free draining coastal sites- it's much better on heavier soils with good moisture if it has to fight off coastal exposure. Likewise Ilex aquifolium can get damaged in coastal spots if there's too much salt/exposure and not enough water.
Tamarix are also classic coastal plants, and we recommend them to customers with exceptional exposure because they flex in the wind. As Phil says they have great flowers from red through pink and even to white, depending on variety. They're not dense enough to stop people looking in from nearby, but will create a sort of 'net curtain' effect from further away.
Escallonia are worth avoiding for two reasons in this case- they aren't keen on shade and also they're currently being wiped out but two diseases (working together!) in Cornwall and Devon, and it's fair to say that there is a good chance that these diseases will spread in due course.
I deal with a lot of customers with tricky coastal gardens in Cornwall, and am very glad I live a long way inland!
"They're not dense enough to stop people looking in from nearby, but will create a sort of 'net curtain' effect from further away."
Tamarisk can get leggy Ben, I do agree. However, Tamarsisk is a bullet proof plant that is really stimulated by pruning and if pruning/clipping is carried out regularly, it will stay dense and impenetrable at the bottom.
Phil Voice said:
And of course if you grow a summer/autumn flowering one you can prune in spring to keep it compact and still get flowers. I suppose if you plant a double (or even triple?) row of them you could make a spectacular and dense hedge full of flowers.