Help - Royal Mail Shipping Module

Had a problem with orders to Eurozone48 not going beyond step 1 of the checkout process. Trying to be clever, I uploaded the Eurozone48.php file from the latest update 2.25. Since then the shipping modules are displaying the following error:

Warning: include(/home/carregle/public_html/includes/languages/english/modules/shipping/eurozone48.php) [function.include]: failed to open stream: No such file or directory in /home/carregle/public_html/admin/modules.php on line 173

Warning: include() [function.include]: Failed opening '/home/carregle/public_html/includes/languages/english/modules/shipping/eurozone48.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/carregle/public_html/admin/modules.php on line 173

I checked the shipping folder and found that the new file had been renamed due to duplication with existing file - sorted out the naming problem, but the error above won't go away.

Is there another step I need to take to register the new file, or is there some code that I can change?

I don't really want to reinstall the entire Royal Mail module as the postage rates are all set and don't want to have to redo them if I can help it.

Any help and suggestions will be really appreciated.

+++UPDATE+++

I fixed this, despite the error message saying it couldn't find the file eurozone48.php, renaming it to eurozone_48.php solved the problem.

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However, I still have the problem of not being able to move beyond step 1 of the order process.

I have tried to purchase a product weighing 3kg (within the allowance for the shipping product and put my country as France, again within product rules) can someone help and give me a clue?