Angus steakhouses are shite, stay away. What's your budget? If you go to any branch of The Hawksmoor before six on a weekday, they have an express menu that is two courses for £23 or 3 courses for £26. Ribeye is on the express menu and it's very good.
Though I've not been there myself, I'd echo this. I know a lot of people who speak very highly of Hawksmoor. It'd be important to get a deal though, as it might blow your budget at peak times.