Haven't eaten out in London for a while now but being a bargain hunter - you do get some decent offerings with soft launches (usually 50% off).
https://www.hot-dinners.com/Offers/Hot-Dinners-Restaurant-Offers/
A few ones I remember from the past that I enjoyed.....Benares (Indian/Mayfair), Dishoom, Pix (chain of lovely tapas restaurants), Le Garrick (cute French restaurant), River Cafe (loved this place), Noble Rot, Macellaio (great steak chain).
