Too good to be true

I am writing this because I need your opinion guys...... Last week I was surfing the net and I came across this website jobsly.com. They posted this job order about a caregiver for a nursing home in london for an hourly rate of 14 pounds per hour. I checked some caregiver sites and the rates are only about 5 to 8 pounds per hour. Anyway they want me to go on an interview through the net. I was not able to reply right away. Maybe a good 3 days and they said my window has closed and now I need to take some kind of assessment test and detailed credentials review. I want to ask for any job order, is there any government body that is in charge of all of this may it be nursing, caregiver or any other field? Hope you guys can enlighten me. Or do companies specifically staffing agencies need to have a registration from some kind of gov agency.