Thanks for your replies - good suggestions and things to think about.

I am based in South East London in the UK - sorry, I thought that appeared on my message in the right hand corner.

We were thinking of cherry laurel which I believe is less rampant than other types? But perhaps you are right and it would be a bad idea to plant it in this small space. Have no idea what privet smells like - will make sure I check that out.

Thanks again. I will investigate your plant suggestions and will make sure I draw a scale plan.