That looks like a young plant of Meconopsis nepaulensis and, as your seller advises, it will flower once and then die. They sometimes take two or three years to reach flowering size so you do not need to do anything with it just now.

I agree with Bulbaholic. Should stay evergreen too.

Thank you. I was naively expecting it to flower this year.
How should the plant be looked after over winter, will it need any protection from frost? It is in quite a sheltered position in the garden.

I don't do anything for them in winter. They are quite hardy.

Thanks again for your advice....hopefully they will grow on and flower.