I finally got around to upgrading to the RC. I did a fresh set up of October. I've now noticed by Event log getting flooded by two messages:

exception 'InvalidArgumentException' with message 'There are no commands defined in the "scheduled" namespace.

Did you mean this?
schedule' in /var/www/blog.mikeambro.com/public_html/vendor/symfony/console/Symfony/Component/Console/Application.php:501
Stack trace:
#0 /var/www/blog.mikeambro.com/public_html/vendor/symfony/console/Symfony/Component/Console/Application.php(535): Symfony\Component\Console\Application->findNamespace('scheduled')
#1 /var/www/blog.mikeambro.com/public_html/vendor/symfony/console/Symfony/Component/Console/Application.php(192): Symfony\Component\Console\Application->find('scheduled:run')
#2 /var/www/blog.mikeambro.com/public_html/vendor/symfony/console/Symfony/Component/Console/Application.php(126): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#3 /var/www/blog.mikeambro.com/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(94): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#4 /var/www/blog.mikeambro.com/public_html/artisan(36): Illuminate\Foundation\Console\Kernel->handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#5 {main}

And this one:

exception 'InvalidArgumentException' with message 'Command "queue:cron" is not defined.

Did you mean one of these?
queue:work
queue:restart
queue:listen
queue:subscribe
queue:failed-table
queue:flush
queue:failed
queue:retry
queue:forget
queue:table' in /var/www/blog.mikeambro.com/public_html/vendor/symfony/console/Symfony/Component/Console/Application.php:549
Stack trace:
#0 /var/www/blog.mikeambro.com/public_html/vendor/symfony/console/Symfony/Component/Console/Application.php(192): Symfony\Component\Console\Application->find('queue:cron')
#1 /var/www/blog.mikeambro.com/public_html/vendor/symfony/console/Symfony/Component/Console/Application.php(126): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#2 /var/www/blog.mikeambro.com/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(94): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#3 /var/www/blog.mikeambro.com/public_html/artisan(36): Illuminate\Foundation\Console\Kernel->handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#4 {main}

If anyone has any ideas what could be causing these and how I can go about fixing them it would be greatly appreciated.

You need to remove this line from your cron and replace queue:cron with schedule:run

Thanks a lot, that did the trick.