Beware of gift cards

My friends just came back from a tour of The Cotswolds in the UK and they just raved about it. They were kind enough to bring back a couple of gifts from Prince Charles' estate "Highgrove"; a lovely bar of lavender and thyme soap, some thyme seeds and an ornament for our Christmas tree that looks like a blazer patch with the Prince's feathers on it. Very nice. The best thing, however, was this card. 

What do you suppose they're trying to say?