Cheshire police virus? Remove from Macbook Air.

A fake message blocked my safari. I did a complete shutdown and restart and there is no problem with safari but how can I check no virus has become a part of the laptop, and remove it if it has?
Thanks.

I left out the last part of that comment.
If the Preferences menu item is grayed out, quit Safari. Force quit if necessary. Relaunch it by holding down the shift key and clicking its icon in the Dock. From the menu bar, select
Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data
to get rid of any cookies or other data left by the server. Open your Downloads folder and delete anything you don't recognize.

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