Data Revolution is one of the brands used by a UK based recruitment agency named VMR Consultants. As a hiring manager they are the worst I ever encountered - sending template emails every day where only the candidate name would change. Looking at their Glassdoor profile they look like an abusive employer as well. I am usually nice to people but in their case I would straightforwardly answer “sorry, I blacklisted your firm” and hang up to any poor soul cold calling on behalf of one of their brands… Stay away!