Posted: 22/08/2015 at 16:27
If it's soggy ground I'd avoid Beech - it doesn't appreciate wet ankles. Hornbeam would be better. If you want evergreen, Privet is semi evergreen but would do well there, Holly would be very nice, and some of the less domineering Thujas like Smaragd . Don't forget Taxus - yew. Whatever you choose, prepare the ground well by clearing grass and any weeds to create a proper border, and then dig in compost, well rotted manure and grit if the drainage is suspect. A sprinkling of Blood, fish and bone will benefit the new plants too, as well as a mulch once they're all in.
It will be expensive to do that whole boundary with pot grown plants, but this is the time of year for bare root hedging so take a look online at some of the specialist nurseries. Don't make the mistake of thinking that bigger is better. Smaller plants/whips will establish better and grow more quickly in the long run.