Do you have current certification in First Aid, and CPR?

This question is pretty basic, considering it's either a yes or no answer. With that said, the interviewer would like to see you elaborate on details such as when you received your certification, and when your certs are up for renewal. Be sure to bring your certifications with you so that the hiring authority can take copies for your candidate file.

If you are not certified, express that you are willing to obtain this certification on your own time. Chances are, G4S may put you through the training once hired; however, it's nice to offer as this shows enthusiasm and initiative.