on the confirm page, you have changed the name and ID of the form element that passes the sellers email address to paypal:
change:
<input type="hidden" name="Upton Snodsbury Parish Recreational Association" id="Upton Snodsbury Parish Recreational Association" value="youngupsnods1@aol.co.uk" />
back to:
<input type="hidden" name="business" id="business" value="youngupsnods1@aol.co.uk" />