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Advice for hedging in Glasgow - with a few ground issues

I live in Glasgow and would like to plant a 'hedge' in my front garden, I stripped away 60cm wide strip of turf and began to dig over where I encountered a concrete bed around 20-25cm down pretty much covering the full 60cm width. My front garden borders to some parking for my neighbours and whilst I expected to be met with a bit of a concrete reinforcement I didn't expect it to encroach as far as it does.
Initially I had wanted to plant Laurel Caucasica and maintain at about 1m tall, I am led to believe that the soil needs to be deeper than this so am looking for alternatives that could provide a suitable boundary that doesn't need to be too high, just enough to stop people using my garden as a short cut.
The boundary is east facing and in Glasgow so needs to be hardy enough to withstand the conditions.
Any advice would be greatly appreciated as my other options are to reseed with grass or put pebbles down (the lawn has just been hollow tined and top dressed so is looking a little miserable)
TIA
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Pansyface I will definitely get it planted in the soil, would you think it would be ok under my window where the grey tub is currently, the border under my window is a work in progress bench the pots, just sussing out where stuff can go?
If you can make the border a bit wider, you could have beech. It really depends on how much work you put in with prep and initial care. I've done hedges in very similar situation no problem, but it might be worth putting a proper edging along the grass, so that you can get some more organic matter in there, and it will be less of a problem with the footings. I did a hornbeam hedge along a pavement edge in a previous garden, and we also had two very mature, established trees [ a maple and a lime] along that boundary. It was absolutely fine, and it was only the ones nearest the trees which took a bit longer to get going. I've also done a hedge in this garden, no problem, with similar conditions. It's the prep that matters most, so that mustn't be skimped on
It's not a good time to plant hedging, even though in normal years it would be fine at any point here, because it wouldn't be so hot and dry. However, it's expensive, as you'd have to buy potted specimens. If you can wait until October, you can buy a good amount of bare root planting, at a smaller size, which means you can plant more densely, and very economically. It'll establish more quickly and more easily. If you don't need it to be very high, it's easier.
I also understand the problem of people cutting across. You could use hawthorn
I live in west central Scotland - not where that photo is...
1 - how much wider would I need to go
2 - Would it be good in well draining soil of about 20 cm deep?
3 - Does it respond well to shaping (traditional straight sides and flat top)
Thanks
A hedge 90º to the path, joining the apex to the house, might serve to meet your no-short-cuts objective. Or a series of shrubs.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."