laravel 5.8 Auth/RegisterController custom redirect on validation failure

I'm using Laravel 5.8, I have a single page that has both the Registration and Login forms (2 separate forms posting to the respective endpoints/controllers)

My Registration Form posts to the Auth/RegistrationController as provided by Lavarel Auth.

I would like to change the behaviour so that on an unsuccessful registration attempt it will add an additional parameter to redirect url so I know which form to apply to validation feedback too.

I'm already aware of the redirectTo variable this appears to be for successful requests though

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