I have already tried LiquidCrystal1.0 and had no joy with it.
Having nothing to lose I'll give 440 a try.
I have also tried the system suggested by Julyan Ilett for identifying intelligent LCD operations and even that hasn't helped so far.
It is also interesting how few (apparently none) 6 X 20 displays there are on the market now so there's nothing to compare it to.
If I manage to crack it I will post the information in the vague chance it will be of any use to anyone else.
Dale H