My wife and I (early 60's) went on this tour with the positively engaging Matt Lee and loved it. It's a lot of walking, so don't expect cab service from stop to stop. But there's a lot of tasty food to be had (and Matt tailors this to those on the tour so everyone's happy with the choices). Our tour included a perfectly cooked beef/ox-heart burger, tacos, Ghanian fish and meat dishes, stunningly good coffee, Hungarian desserts (cheese and cherry), and Scotch eggs.
But even better than the food was the time with Matt. He's so passionate and knowledgeable about the London street scene and the neighborhoods outside central London that you get a great tour of areas you would never otherwise have visited. And his interests span a wide range of subjects--the arts, restaurants (he's a critic for Time Out), politics, etc.--so he's an absolute delight to spend time with. It was a real London trip enhancer for us. And it was an excellent value.