[Zope] unicode support

[Garry Saddington]

I am using Zope 2.9 connected to a Posgres DB via psycopg. My database encoding is UTF8. 
I am getting the following error when users try to insert text in the database containing £ signs:
ERROR: invalid byte sequence for encoding "UTF8": 0xa3

This is due to the encoding of a £ sign in the text being sent to the DB.
My question then is how do I make sure that all encodings submiitted from forms are in the correct UTF8 format?
Regards
Garry
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