is @email.apple.co.uk a valid email address or is it a phish?

Looks like phishing attempt. Don’t respond to this email. It’s a phishing attempt. Report this scam to Apple: reportphishing@apple.com

You will find more information about phishing attempts here:

https://www.apple.com/legal/more-resources/phishing/

https://support.apple.com/en-us/HT204759

As far as I know, all Apple addresses in the UK are ... apple.com/whatever.