Did one with BA last year and have another one with them in 2 weeks time.
Organised both these myself though after finding the right person to contact at BA, who was extremely helpful.
Fam flight itself went very smoothly. Crew were great, knew I was coming (as did dispatcher at the gate) and made me feel very welcome. Even managed to make NATS cough up expenses for car parking & fuel. Got fed and watered royally on both sectors so BA gets a big thumbs up from me.
On a serious note, it was very worthwhile for me and even the crew said they got something out of it as they were able to learn a bit more about procedures and why it is that we do what we do.
RYR are not in the fam flight list. Stan Woolley, I would suggest you get your head of flight ops to have word with somebody at NATS if you want to get your lot involved. With the amount of people at Swanwick who live near Bournemouth, I am sure there would be no shortage of takers.