On the notion of "orbiting" this once happened in my early stages of the PPL landway under dual instruction.
Southend ATC instructed an orbit on the downwind leg.
So my instructor took the controls and did the orbit.
Watching some You Tube videos for a LGW Transit - there is an instruction similar to "Proceed to North Terminal Build and hold North of Runway xx".
The P1 then obliges.
Question - Would the "hold" be an orbit - and would the "orbit" be a 15 degree Angle of Bank rate 1 turn with the turn co-ordinator on the first notch?
Or are would a quick calculation have to be worked out to establish according to TAS what AoB is required subject to the speed you are flying?
Same question applies if instructed to orbit on downwind...
Scoobster