Thanks guys,
Always reassuring to hear your not doing something wrong! Can't believe that what is probably such a well used function could have existed for so long without someone else noticing it.
Now that we know, Dave, how do we draw it to the attention of those who code the 'bus? I should have also mentioned I was using the A320 so 'AAC47' did you try the A330. I don't know if it is the same code ported across and don't have the 330 to try.
Kevin