Simple PHP shipping module modification - Opencart

I need someone to help write a line of PHP code for my opencart shipping module. A section of the shipping module PHP file is below. Fastway and A-national are both courier companies. Currently the script does this: All products will be shipped with fastway courier. However If the item is over 25kg and over 100cm, then it will be shipped with A-national. What i need to do is simply add a line of code which makes all products from a certain manufacture to always use the A-national courier. There is a manufacturer field inside opencart and all products under this manufacturer will have to use the A-national courier. A-National Courier shipping quote is using this calculation, you can see in script. $calprice=$baseprice+$weight*$perkilo; $calfuel=($calprice*16.9/100)+$calprice; $calfuel=$calfuel+($calfuel*0.1); Its a pretty quick and straight forward job i think and it will be easy for someone who knows PHP very well and some familiarity with opencart. ------------------------------------------------------------------------ class ModelShippingFastway extends Model { function getQuote($address) { $lengths=$this->cart->getProducts(); $ll=0; foreach ($lengths as $length){ if ($length['length']>=100) {$ll=$ll+1;} } $query=$this->db->query('select * from expresspost where postcode="'.$address['postcode'].'" '); // if ( ($ll > 0 || $this->cart->getWeight() >25) || ($this->cart->getWeight() >25) && $query->row['status']==0 ) { if ( !empty($query->row) && $ll > 0 && $query->row['status']==1 || $this->cart->getWeight() >25 ) { $zone=$this->db->query("select * from expresszone where zone='".$query->row['zone']."'"); $weight = intval($this->weight->convert($this->cart->getWeight(), $this->config->get('config_weight_class_id'), $this->config->get('fastway_weight_class_id'))); $baseprice=$zone->row['baseprice']; $perkilo=$zone->row['perkilo']; $minprice=$zone->row['minprice']; $calprice=$baseprice+$weight*$perkilo; $calfuel=($calprice*16.9/100)+$calprice; $calfuel=$calfuel+($calfuel*0.1); $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "zone_to_geo_zone WHERE geo_zone_id = '" . (int)$this->config->get('flat_geo_zone_id') . "' AND country_id = '" . (int)$address['country_id'] . "' AND (zone_id = '" . (int)$address['zone_id'] . "' OR zone_id = '0')"); if (!$this->config->get('flat_geo_zone_id')) { $status = true; } elseif ($query->num_rows) { $status = true; } else { $status = false; } $method_data = array(); if ($status) { $quote_data = array(); $quote_data['fastway'] = array( 'code' => '[login to view URL]', 'title' => "A - National Courier", 'cost' => $calfuel, 'tax_class_id' => $this->config->get('flat_tax_class_id'), 'text' => $this->currency->format($this->tax->calculate($calfuel, $this->config->get('flat_tax_class_id'), $this->config->get('config_tax'))) ); $method_data = array( 'code' => 'fastway', 'title' => "A - National Courier", 'quote' => $quote_data, 'sort_order' => $this->config->get('fastway_sort_order'), 'error' => false ); } return $method_data; } else { $this->load->language('shipping/fastway');