Eye Spy Sunglasses is £7.89 inc delivery from Shop-com.uk
See behind you whilst you give the appearance of looking ahead. Not sure if MI5 use these Sunglasses but description says that these are being recommended to MI5, CIA, KGB & Mossad :) At the least you can keep an eye on stalkers !!
Description : These are not just ordinary sunglasses. Besides protecting your eyes from the suns harmful UVA and UVB rays, the Eye-Spy TM sunglasses will also give you another type of protection. Recommended to secret service organisations around the world, including MI5, CIA, KGB & Mossad, the special spy-lenses in the Eye-Spy TM sunglasses allow you to inconspicuously see behind you whilst you give the appearance of looking ahead. Use them to be vigilant; on a stakeout; to see who's walking behind you; find out who's watching you in public places like bars, beach, clubs or restaurants.