I am afraid I am unqualified to offer any opinion on British bombsights. I understand that the Mark XIV/T-1 was very good and could be set up for a bomb run in short order. I despair somewhat of ever getting a T-1 up and running; I have an unused computer and the sightheads can be found, but they were connected by rotary drive shafts that appear to be quite rare. In addition, to get one up and running you would need a vacuum system to run the gyro as will as pressurized air to run the pitot system. Still, I sure would like to take a crack at getting one going. Next week I plan to start on a Sperry S-1.