The big picture.
The smaller quieter heli (GPIXX) has smaller less powerfull lens.
So to get the same closeup as Sky it needs to be at least half the distance from the action increasing noise 4x
On Sunday Mark Stevens, whale rescue coordinator said that he had asked BBC (GPIXX) to move away as it had affected the whales breathing rate!
On numerous occasions throughout Sunday Sky demonstrated their distant position from the whale, going on about how the heli wasn't interfering with the rescue.
The previous day BBC had a twin with long lens available and no complaints reported.
Single engine regulations restricts operation
No floats limits areas to land safely when operating over Thames in single
Low power lens restricts angles and locations to get the shot.
Exclusion zone at the oil fire was 5 miles
To put this in perspective 250 BBC executives are paid over £100k per year.
Creaser