Thank you! That is really helpful input and valued. I have already learnt a lot! I think I'm going to focus on boosting the soil, before I consider any further planting. As you say, the other conifer may appreciate the space too. I must say, the columnar yew looks lovely, as does the Holly and Mahonia. I have this idea of trying to enclose the garden and make it more private (by planting trees around the edges). The columnar yew, planted in the right soil and place, looks like a very nice option!
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Thank you again for all the advice!