Hi slabbi,
That's great, thank you for pointing me in the right direction.
For those interested I change line 595 of includes.php from
Code:
echo "<a href='".uddeIMsefRelToAbs("index.php?option=com_uddeim&task=new&Itemid=".$item_id)."'>";
to
Code:
echo "<a href='".uddeIMsefRelToAbs("index.php?option=com_uddeim&task=new&recip=XX")."'>";
Where XX is the user id.
So now when a user clicks on compose the ensuing form has the 'To:' field pre-filled with the username of userid XX.
Thanks.