Looking to potentially hiring a Red double Decker Bus take the guests from...

Looking to potentially hiring a Red double Decker Bus take the guests from the hotel (Depending on where everyone is staying) to the wedding venue as it is all happening in one place, and then back again at the end of the night. Has anyone got any recommendations/prices for this for the Kent area? Any sites I can find don't give you a price and are very vague about what they charge/what they do? Or has anyone had experience of doing this and if it is worth it?