We selected The English Bus based on the reviews, and the actual trip more than lived up the reputation! Our guide was Andy. His depth of knowledge of the history of all the places we visited right from the city through the entire tour was remarkable. The bus itself was really comfortable, and the schedule was paced well, considering there are so many things packed into a single day.
The only suggestion for TEB is to improve the positioning of the microphone for the guide while driving. The volume is ok, but it only works when the guide turns towards the mic. People at the back of the bus can barely hear the voice and we had to strain a bit.