Cert has expired but I don't know credentials

Hi Andy.

Thanks for coming back to me so quickly.
We use the SSL purely for Office 365 Outlook connections.

domain name: precisionunderwriting.co.uk

operating system is (include version): N/A (just used for O365)

web server is (include version): Don’t know

hosting provider, if applicable, is:123-Reg

I can login to a root shell on my machine (yes or no, or I don’t know):Don’t know
I’m using a control panel to manage my site (no, or provide the name andversion of the control panel):Yes, on 123-Reg

Regards, Brad.