Just a follow-up to my post - Dyrham Park have got back to me and the lilac flower is indeed Campanula Lactiflora, the glossy low hedge is Prunus lauracerasus 'Otto Luyken'. Thank you to @Dovefromabove for suggesting I get in touch with the stately home - you were right, they were pleased to supply the info!
That's great @c_watkins, tha nks for letting us know ... I'm glad my faith in professional gardeners has been rewarded ... most of the ones that I've met have all been really lovely people who enjoy sharing their knowledge and enthusiasms.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.