So my work place CCTV has been broke for 5 days is this legal?

They have a couple of cameras still working which are monitoring the upstairs corridor and office, yet only one monitoring the end of the till which is positioned so can only see me and my colleagues serving, cannot see any customers or any details such as money and what we are handing over as its that far away. Its been broken for 5 days now and i dont feel safe is this legal? I thought my manager should of got it fixed by now!