Is yahoo.co.uk a legit website?

Did you receive an email from someone with an address @yahoo.co.uk? Did you find some information or an offer on a website starting by http(s)://yahoo.co.uk?

Probably fraudulent: Public email service

What does that mean?

It is highly probable that you cannot trust this source.

Legitimate staff do not usually use this kind of platform to communicate about work-related topics. Ask them to contact you from an official address, and do not trust any future message coming from the current address.