$params = $_SERVER;
$params[MagentoStoreModelStoreManager::PARAM_RUN_CODE] = 'uk'; //Webite code as same in admin panel
$params[MagentoStoreModelStoreManager::PARAM_RUN_TYPE] = 'website';
$bootstrap = MagentoFrameworkAppBootstrap::create(BP, $params);
/** @var MagentoFrameworkAppHttp $app */
$app = $bootstrap->createApplication('MagentoFrameworkAppHttp');
$bootstrap->run($app);