Boots and Debenhams are respected retailers in the UK, they have no need to sell fake fragrances. And if they were, it would have been noticed long ago
Maybe its just you? You seem to have lots of fragrances that you say are real, and the others are fake. Maybe the ones you originally bought are fake, and the ones you have seen in the stores are real??
Like I said before, Boots and Debenhams have no reason to sell fake perfumes, I mean, why would they need to??
Ive bought quite a few perfumes from both Boots and Debenhams, and never had any problems whatsoever