After much playing around, (I am very much an amateur programmer), I found that putting the function from Beau91324 (thanks Beau!) in: includes/classes/order.php here worked -
$this->notify('NOTIFY_ORDER_PROCESSING_ONE_TIME_CHARGES_BEGIN');
// build output for email notification
$this->products_ordered .= $this->products[$i]['qty'] . ' x ' . zen_get_products_manufacturers_name($this->products[$i]['id']) . $this->products[$i]['name'] . ($this->products[$i]['model'] != '' ? ' (' . $this->products[$i]['model'] . ') ' : '') . ' = ' .
$currencies->display_price($this->products[$i]['final_price'], $this->products[$i]['tax'], $this->products[$i]['qty']) .
($this->products[$i]['onetime_charges'] !=0 ? "\n" . TEXT_ONETIME_CHARGES_EMAIL . $currencies->display_price($this->products[$i]['onetime_charges'], $this->products[$i]['tax'], 1) : '') .
$this->products_ordered_attributes . "\n";
$this->products_ordered_html .=
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