I am of the opinion that unless you are absolutely certain that the
data will be pure ASCII you should declare string fields in model as
Unicode type rather than String. Also have a look at
http://farmdev.com/talks/unicode/
because it will help you understand what the dreaded error really
means.
Thanks to you both.
Michael, I must apologise - I had overlooked that another field was
receiving Unicode characters. Changing this field to the Unicode type seems
to have fixed the problem.
Victor, you are right of course - I do have an understanding of what the
dreaded error actually means,
