How to connect Ring Doorbell Wired to existing chime?

Hi all, I have recently purchased the Ring Doorbell Wired. My house already has existing doorbell wiring but that has not been used for the past 5-6 years as I have been using a battery doorbell with a plug-in chime. I have a compatible transformer in my consumer unit as well as a doorbell switch. I am assuming the doorbell switch in my consumer unit is for my transformer. I have opened my chime and can see that the wires have been disconnected by the previous owner so as a result, I am not sure which wire is which. I have attached a photo and would appreciate if someone can help me to bypass the chime and get power to my doorbell.