LindaMae's Plumbago

Bought this in Norfolk just a couple of weeks ago. I notice no one on here who is in the UK is growing it and I’m wondering if it will survive and how I should treat it. Everything I can find is about growing it in warmer climates, all I know for here is that it needs sun and it needs brought inside in the winter. This plant has already been cut back a bit to promote some growth – I’m wondering if I should dead head it as the flowers die off or treat it as a shrub and prune it once ayear and if so when.