Interflora

It's not often we can say this about a merchant, but if you need to know more about Interflora then check them out on Wikipedia! They're that big and they've been in business that long (originally started in 1920!)

Essentially they are a florist site with delivery throughout the UK and throughout the world. They have themed bouquets and presents suitable for birthdays, anniversaries, weddings, birth, and housewarming. Apart from flowers they provide hampers and present sets that can include wine, chocolates, gourmet delicacies and fresh fruit.

As their famous advertising campaign said ... whatever it is, "say it with flowers".