Help trying to rename the shipping method per item & best way

Hi, please help. :(

Iam trying to rename the shipping method:
Per Item to Standard U.K Delivery &
Best Wat to Standard U.K Delivery £1.99 ( Additional Items 0.99p per Item)

Tried changing in includes/modules/shipping:

item.php:

define('MODULE_SHIPPING_ITEM_TEXT_TITLE', 'Per Item');

define('MODULE_SHIPPING_ITEM_TEXT_DESCRIPTION', 'Per Item');

define('MODULE_SHIPPING_ITEM_TEXT_WAY', 'Best Way');

To:

define('MODULE_SHIPPING_ITEM_TEXT_TITLE', 'Standard U.K Delivery £1.99 ( Additional Items 0.99p per Item)');

define('MODULE_SHIPPING_ITEM_TEXT_DESCRIPTION', 'Standard U.K Delivery £1.99 ( Additional Items 0.99p per Item)');

define('MODULE_SHIPPING_ITEM_TEXT_WAY', 'Standard U.K Delivery');

looks ok, on the delivery information screen, but i cant progress to step 2.

Iam sure iam missing somethink, have i left out a file iam suppose to rename as well????

Please help :bigups: