I want to default the 'Subscribe to Newsletter' to be checked.
 
I know how to get this checkbox is enabled to be shown on screen by enabling 'Subscription' block under the Profile->Pre Defined fields settings.
 
But I dont know how to then make it enabled (Checked) by default on the actual page.
 
Any Help?

Additional points
 
I have tried modifying this line in block_user_profile.html
 
<input type="checkbox" name="subscribe" {subscribe} value="1"/> {SUBSCRIBE_CHECKBOX_MSG}</label>
 
 
to be::
 
<input type="checkbox" name="subscribe" {subscribe} value="1" checked/> {SUBSCRIBE_CHECKBOX_MSG}</label>
 
 
But this doesnt seem to be being picked up when the form is submitted?

your solution must work. are you sure you have edited the right file?

Yes, and as a test I changed the PHP code for the page to REQUIRED for the check box and if I click submit it reports that its still "required"??
 
I want to make sure I have touched all the bases