Taxiway Q
This was designed many years ago to allow two routes for aircraft to access Terminal 2 and the big cul de sac at busy times to minimize taxying delays. Obviously it required that stands (61-65?)were not in use.
As the based fleets grew up with their night stops, it was impossible to accommodate them all without using these stands and so it fell into infrequent use. Now the based fleets have reduced, but so have the number of aircraft stands, to be used for the far more lucrative car parking.