Multiple menus issue

I am trying to add two menus to my theme, one in the header navigation and one in the footer. Both menus are to have different links. In wordpress admin I have set up two menus, one called Main Menu and the other called Footer Menu but on the page both are displaying the Main Menu links.

Can anyone see where I have gone wrong?

In functions.php

register_nav_menus( array(
	'primary' => 'Main Menu',
	'secondary' => 'Footer Menu',
) );

In index.php for main menu

<?php
wp_nav_menu(array(
'theme_location' => 'primary',
'container' => false
));
?>

In index.php for the footer menu

<?php
wp_nav_menu(array(
'theme_location' => 'secondary',
'container' => false
));
?>

Is there anything else I need to do to get bothy menus working?

Thanks