As a change from the more expensive eateries on Charlotte Street, here are two very good, very traditional English options near Goodge Street station.
I went into Gig's (12 Tottenham Street) after noticing the long queue outside at 11 on a Friday night, after a couple of pints in the Hope. A large, lightly fried, blisteringly hot piece of cod, in a nice crispy batter, with excellent, quite thickly cut chips. After adding salt, good mayonnaise and vinegar, I felt as if I was by the sea. Kebabs also looked good, and are cooked on charcoal.
I've been going to Fresco, right next to the station, on and off for ten years. The sandwiches are fairly standard, but the breakfasts are excellent and they're generous about giving you exactly what you ask for. Very good back bacon, cooked on a ridged grill, which gives the thin slices nice char marks. Tomatoes and mushrooms are also nicely charred. And the poached eggs are properly cooked, which makes a nice change. (Had very bad scrambled--microwaved and rigid--eggs at Marino's on Rathbone place a couple of days earlier.)
At the higher end, I'll happily add to the paeans of praise that Salt Yard has been receiving. We had snacks rather than a full meal, so I didn't get to try a very wide range of the menu. From a limited survey, it seemed as if some of the basic options were the best--particularly the juicy chorizo sausage in a sweet vinegary reduction, and the excellent charcuterie meats.