Anyone can have a UK phone number and price in pounds. I've got a London phone number for work, but you won't find a London office with the business name on the door.
HDEW
"Please note that by making a purchase on this website you will be acting as the importer of the product for all purposes including all customs regulations,copyright and trademark laws.You accept that the role of HDEW Cameras is limited to sourcing products and making them available for you to import directly from the country of origin.By purchasing a product through this website you authorise us to make arrangements for clearance of customs on your behalf for the products you have ordered."
Panamoz
"This User Agreement and any transactions on this Site shall be governed by and construed in accordance with the laws of Hong Kong applicable to agreements made and entirely to be performed within Hong Kong, without resort to its conflict of law provisions. You agree that any action at law or in equity arising out of or relating to these terms and conditions shall be filed only in state or federal court located in Hong Kong, and you hereby irrevocably and unconditionally consent and submit to the exclusive jurisdiction of such courts over any suit, action or proceeding arising out of this User Agreement."
If a deal is too good, that should be trigger enough for a buyer to query why and read the terms and conditions.
I have attempted to explain how some of the UK-based grey importers work in previous threads, but they get tetchy about discussions of their offshore corporate structures.