Hi, My garden is looking a little bare at the moment so I am looking to place a few ornamental conifers around, to add stucture and winter interest. I am looking for lighter greens and yellows, and conifers that grow to about 8-10ft high, I thought of Thuja "emerald green" for one of them, and there is also a conifer called "goldcrest" I see for sale alot but I don't know how hardy they are, and seem to get differing information on how tall they will get, I am in one of the colder parts of the UK, so they need to be hardy, any other conifer recommendarions?

I would also like some ideas for evergreen shrubs I can use to form a mixed evergreen hedge, I am going to use different varieties of Holly for most the hedge, but would like some other species to mix with it that will grow to about 10ft and will not lose leaves or go brown in cold winters.
I was thinking of cotoneaster lacteus and berberis julianae, to mix with the holly, would these be hardy and look ok with the holly? and any other recommendations would be welcome! Thanks