I've tried adding $data to the function set as the 3rd parameter which hasn't helped

Mail::queue(array('text' => 'emails.plaintext'), $data, function($message, $data)
{
        $message->from('[email protected]', 'My Name');

        $message->to($data['email'])->subject('Email Subject');
});

I've also tried defining a new variable for the email which hasn't worked either

$email = $data['email'];

Mail::queue(array('text' => 'emails.plaintext'), $data, function($message)
{
        $message->from('[email protected]', 'My Name');

        $message->to($email)->subject('Email Subject');
});

You, Sir, are a rockstar. That did the trick. Thanks.