Hi John,
Great Advice. Worked a Charm!
Slightly different approach.
I created another installation of SambaPOS on the Windows Account the Tablet uses. ie TABLET
I then Logged into the new SambaPOS(which resides in a different directory to the one the till uses) on the Tablet and in Local Settings set the Terminal Name: TABLET rather than TILL. As advised.
In the Rules section, I entered the condition = TILL for all Pole Display Rules. Which meant any rules relating to the customer display will come from the TILL terminal only.
However, the error I originally received would not even let me log into SambaPOS hence I was unable to even change terminal name. To be able to log in I had to logout of the main terminal TILL and then log in via the TABLET and change the Terminal Name.
A very happy ending and would not have been possible without the help of John, Thanks again.