Class not Found for namespace - attempting to override core

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I would like to override the default sharing icons.

I'm getting the following error message
Class 'Application\Src\Sharing\ShareThisPage\Service' not found


The file is located at
{root}/application/Src/Sharing/ShareThisPage/Service.php


//namespace
namespace Application\Src\Sharing\ShareThisPage;
use Concrete\Core\Sharing\SocialNetwork\Service as SocialNetworkService;
use Config;
class Service extends SocialNetworkService
{
//Code stuff
}


I'm attempting to call this from a controller
namespace Application\Block\ShareThisPage;
use Application\Src\Sharing\ShareThisPage\ServiceList; //Does not work
use Application\Src\Sharing\ShareThisPage\Service; //Does not work, and returns the error
//use Concrete\Core\Sharing\ShareThisPage\Service; //Works
use Concrete\Block\ShareThisPage\Controller as BlockController;
class Controller extends BlockController
{
//More code 
}



I've had some help over at this threadhttp://www.concrete5.org/community/forums/5-7-discussion/helpers/... but I'm still struggling to get this working and can not see what I am doing incorrectly.

Can anybody help with this?

TheRealSean