Hedging plant recommendation

i have recently created a much wider planting borders by removing much of the lawn. The east facing boundary has a fence which is not mine. I have some clematis and a climbing rose growing up it on wires but think I should look at a creating a green boundary of a hedge. Hawthorn has been recommended but I’m wondering about a mixed hedge. I don’t want it to grow too wide. Soil is clay. Garden is south facing. This is the border. Welcome planting suggestions. 

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It may be difficult depending on height to maintain as well with the fence
If you still want an hedge yew - beech are nice
I agree with dove