The BBC used to have a policy that if somebody's work had a direct impact on the programme quality, then they got a credit. However, it appears now that you only get a credit if you're in favour with the producer.
I'm not sure about that..... I was a clapper loader, focus puller and then underwater camera operator on many jobs for the BBC and always got a credit.
As a technician it's really the only way you can prove you did something!
On the other hand credits are expensive so I can kind of understand not getting one if you only guest on a job, but if the whole show is based around a helicopter then you should get one.
Pilots who have worked with me have got credits.
farmpilot