I only discovered Marsh Ruby recently despite walking past it so many times. The shop front is unassuming so it is easy to miss.
Just as all the other reviewers say, it's no-fuss, fast and healthy Indian food at budget prices. The portions come in regular or large - I go for the regular and it more than fills me up. Free salad, yogurt and chill comes on the side. Also, staff are always friendly.
For me the big bonus is the option for brown rice and the use of free-range chicken. There's also the option to mix and match your order with 2 different dishes. The meals are light and healthy so I never have that 'food coma' feeling afterwards. Perfect for a quick casual lunch.