I interviewed for a company several of months ago (I got the job by the way) and I did some some online research and reviews on what past employees thought of the company.
I usually take these reviews with a grain of salt. The biggest thing that disgruntled employees had issues with was the high turnover rate. This was a concern for me was I like to stay with a company for as long as possible.
During the Q&A portion of the interview I asked: "What are the reasons that contributed to the high turnover rates during the last few years?"
Interviewer was shocked and wasn't expecting that question and sort of went into defensive mode. As an American living in the UK, I don't know the norms and customs here so maybe this is a thing in the UK? Do employers not like talking bad about their company?