Posted: 30/07/2016 at 16:13
Hi Ian, I know it's always difficult when you remove something that's given privacy so you want 'instant', but the problem is, buying large specimens is almost always a waste of money. Smaller plants will establish better, and you'll find in a couple of years they'll have caught up with, and probably overtaken the big ones. It's something that gets asked frequently here on the forum.
It's also coming up to bare root season, when you can buy hedging cheaply, assuming you want a new hedge. Bare root is very economic, especially when you have a long boundary to fill. If you take a look at some of the specialist online growers, you'll see how much variety there is. I've used Hopes Grove several times, but there are lots.
Alternatively, it's a fence of some kind and climbers to cover it, if you'd prefer that. Things like Clematis montana will cover a big expanse of fence fairly quickly once established. However, nothing will give instant privacy.
I've also used Buddleia to get something quick growing along part of my boundary - they can be useful while other planting grows, and they don't need much care or attention.