Laravel 5.0 - 'Eloquent' not found

I must be doing something really silly..

<?php namespace Blog\Http\Repositories\Eloquent;

use Blog\Http\Repositories\TestRepositoryInterface;
use Eloquent;

class DbTestRepository extends Eloquent implements TestRepositoryInterface {

 public function names()
 {
    $names = ['Barry', 'Steve', 'Geoff', 'Mandy'];

    return $names[array_rand($names)];
 }

}

<?php namespace Blog\Http\Repositories;

interface TestRepositoryInterface
{
 public function names();
}

<?php namespace Blog\Http\Controllers;

use Illuminate\Routing\Controller;
use Blog\Http\Repositories\TestRepositoryInterface;

class HomeController extends Controller {

 public function index()
 {
    return view('hello');
 }

 public function test(TestRepositoryInterface $test)
 {
    var_dump($test->names());
 }

}

This would work in 4.3, but in 5.0 it doesn't for some reason.