I have alwats found j/s rides rather straightforwrd to obtain, with BA, BMi and the like more than happy to have a chat up front to compare notes. As one BA F/o explained to me, it was the only time he had any chance to ask ATC questions. In the one instance i was turned away from the flight deck, the flight attendants explained very curteously that 'things were rather busy up front', but to ask again on the return sector, and hey presto, no problems. I generally find that a GATCO, or UKATTS card does the trick, and I for one am very eager to have the golden opportunity to chat to all those in aviation