Many thanks for the help. Just been to the 3 nearby garden centres and very disappointed with the poor choice. I got some Goldfinch conifers for height, Erysimum, Heuchera in various colours and some geraniums. None of them had the suggested varieties so bought all I could find including some Rozanne, a red-leaved lilac coloured one and a pink with white edged leaves. I have forgotten the names already!
This is the first time she has had a flower bed, since they no longer have a dog and the boys have grown out of kicking balls around. She is likely to neglect it so trying to keep it labour free for her, with plenty of perennials, evergreens and ground cover. I shall get some bulbs later in the year.