Alert Emails - Orders

Hopefully I put this in the right place.
Can someone please point me in the right direction to add additional information to the alert email that tells me an order has been received.
Specifically I want to add the customer's name and customer group to the email.
I am using version 1.5.6.4 with (amongst others) customer group restrict 1.0.3 added in.
Thanks, John

I am using version 1.5.6.4 with (amongst others) customer group restrict 1.0.3 added in.

If the alerted emails needs to be reflected with this extension, contact the extension developer in order to resolve this issue.

There is nothing wrong with the extension. What I am looking for assistance with is changing the entries in order.php to add two extra pieces of information to the email generated at line 509 onward.
John