A friend has a huge lavender hedge. The lavender is one that grows to be about 3 ft high when in full bloom in summer but would be about 2 ft once clipped back in the winter.
You would need to make sure you got the right lavender as they vary in size.
Someone near us had a hedge of photinia alternated with something similar in bright green (not sure what that is, it could be choisya. It looks very attractive.
If maintenance is a problem, why not a fence? One of those decorative ones you can get these days, part boarding part trellis and plant clematis, roses and other climbers towork in and out of it.
I agree with Scribbles. We've had a "mixed hawthorn" hedge planted on two ides of our garden. (This is mostly hawthorn, but has other hedging plants included, e.g. holly.) It was planted in December and is already growing well. The birds love it, and it offers a great deal to support wildlife (from insects, up to mammals.) Wildlife in the UK needs all the help that it can get!
I'd go for hawthorn - pretty, scented flowers in spring and shiny red berries in late summer/autumn. The berries are food for many wild birds and the thorny plants make secure nest sites in spring. The sheer thorniness of a hawthorn hedge at your boundary can be a security plus point, too!
What about Blueberry Burberry hedge. It's a variety of blueberry, makes a lovely evergreen hedge with the benefit of pretty white flowers in the spring, and blueberries in the autumn. Have a look at it, from Thompson and Morgan.
Red berberis is also great for security reasons. Love Phoetinia too, but constant cutting spoil the colour. Must say OH does not miss cutting a massive privet hedge, and about 80 metres of Yew!
I have Griselinia hedges here. They don't take too long to establish, have lovely green leaves and are easy to trim [soft stalks, not woody like privet or laurel] and to keep in shape.
Mine look lovely, visitors comment how nice they are.
I have a Pyrocantha hedge which has the same drawbacks. A few years ago I hacked it right back to a foot width but it is back to about 3ft again. A neighbour has a tiny-leaved variegated holly hedge which doesn't need cutting often and is very attractive. Of course there is also good old-fashioned Privet, and some Euonymus are very easy to shape. I hope you find something to suit your needs.
We are thinking of replacing our 35 year old Berberis hedge around our front garden this winter. It is too wide now and very labour intensive and, of course, very prickly. It is also riddled with ivy. Do you have any ideas for a replacement, preferably easy to keep tidy and suitable for an alkali soil? It has a sunny position. Thank you.