A custom shipping plugin for Exp:resso Store (v1) allowing you to group shipping rules for various countries. Place this class in a file named: store/libraries/store_shipping/store_shipping_zones.php

store-shipping-zones.php

class Store_shipping_zones extends Store_shipping_driver
{
    /**
     * Calculate the shipping total for an order.
     * Use print_r($order) to see all the fields available to you.
     * The fields available also match those in the Checkout tag:
     * http://exp-resso.com/docs/store/tags/checkout.html
     *
     * @param array $order
     */
    public function calculate_shipping($order)
    {
        $eu_countries = array('uk', 'ie', 'fr', 'de', 'es', 'it');

        if (in_array($order['shipping_country'], $eu_countries))
        {
            return 15.00;
        }
        else
        {
            return 30.00;
        }
    }
}