IIRC the conversation went broadly like this:
CFS: "We'd like to change the way we do wingovers in the Griff to make them a little more sporty. What do you think FBH?
FBH: Well, we'd have to check with Bell first obviously, but shouldn't be a drama...
FBH>Bell: Bell, this customer of ours currently does Xdeg AOB wingovers, and would like to increase that slightly to Ydeg. Is that a snag?
Bell: Sorrry, you do WHAT with our aircraft? We've never tested it beyond 50deg AOB! You may want to replace all the important components that you've done this to!
FBH> Red faces all around
RAF: Much reading of contracts and sales pitches to ascertain responsibility and blame!