Why does BA not have a special A380 flight for the public
No insult or sleight intended to our spotter friends but I suspect there's probably little training value in doing a once around the bay with a group of "on-side" enthusiasts who simply want to sample the airframe.
BA want feedback from revenue travellers and they'll get this by operating a revenue service to an out-station with revenue travellers who are more concerned about the entire product (e.g. boarding/food/cabin service/baggage delivery at destination, etc, etc,) than the aircraft
Resources aren't limitless so IMHO it makes sense for BA to use the new airframes to cover an exisiting service rather than using an extra, precious LHR slot, limited gate space and ground support to operat an additional pleasure/
PR flight.