Awww must go to B&M! I had sea lavender and it looks gorgeous but it was one of the plants I lost this winter. Now I know it's safer to delay cutting it back until after the worst of the winter has gone.
I saw it in Morrisons this week but now I don't think the plant I had was Limonium. My one had thin small leaves, almost like spinach. I think I will wait for yours to flower to compare. Such a shame I'd lost it this winter 😣