Few RAF trainer stuff up as well (Pirate13, etc.) so could be an exercise.
Quick reaction stuff usually sent up to intercept/shadow other countries military aircraft if they are approaching or transiting near our airspace without prior agreement or if a civil aircraft does something unexpected like a passenger plane that loses contact, etc.
The RRR stuff is general RAF assets in this case stuff like tankers which might be supporting fighter aircraft in case they need to stay up for some time.
