https://ymgyngoriadau.llyw.cymru/ymgyngoriadau/rhyddhad-trosiannol-i-fusnesau-bach-fydd-yn-cael-eu-heffeithio-gan-ailbrisio-ardrethi
https://consultations.gov.wales/consultations/transitional-relief-small-businesses-affected-2017-non-domestic-rates-revaluation