So, I took the clue bat round to one customer this morning. Explained that the telephones were doing exactly what they had in fact asked for :-)
I then felt rather guilty as they actually asked me to go over to give us a rather nice present.
The next AAISPISSUP we have, I may have to open it and share it around.
Aged 28 years, 58.4% ABV.
It is nice to know that some customers do appreciate the hard work. Thanks Daryl and Guy.