Identify and get value of radio buttons

So, I ran across a problem of identifying radio buttons in my Gherkin. Wanted to be able to look at a page, find the 'heading' of a set of buttons, and see if the one I want is 'checked'. Then the "Error messages to display" radio button should be set to "None" (taken from admin/config/development/logging). Turned out to not be quite as easy as I had hoped for, there is a disconnect between the label and the radio buttons. The label is for the div that contains the buttons, rather than the "name" of the buttons. So, I built this definition to look for a div with the specified label, check if it contains radio buttons, then get the label of the "checked" radio button.

/**
 * @Then /^the "([^"]*)" radio button should be set to "([^"]*)"$/
 */
public function theRadioButtonShouldBeSetTo($identifier, $option) {
  $page = $this->getSession()->getPage();
  $div = $page->find('xpath', "//div[contains(., '$identifier') and @class[contains(.,'form-type-radio')]]");
  if ($div) {
    $radios = $div->find('xpath', "//input[@type='radio']");
    if ($radios) {
      $checkedRadio = $div->find('xpath', "//input[@type='radio' and @checked='checked']/following-sibling::label[contains(text(), '$option')] ");
      if (!$checkedRadio) {
        throw new \Exception(sprintf('We found the radio buttons for "%s", but "%s" was not selected.', $identifier, $option));
      }
    } elseif (!$radios) {
      throw new \Exception(sprintf('We found "%s", but it did not contain any radio buttons".', $identifier));
    }
  } elseif (!$div) {
    throw new \Exception(sprintf('We couldn\'nt find "%s" on the page', $identifier));
  } else {
    throw new \Exception('General exception from '.__FUNCTION__);
  }
}

Our use-case is to run a series of tests against a live site (but not change anything on live), and make sure that a deployment checklist was followed by testing the values of various settings.