public void Validate()
        {
            VATStatusViewModel.Validate();
            PAYEStatusViewModel.Validate();
            TaxReferenceViewModel.Validate();

            IsValid = VATStatusViewModel.IsValid && PAYEStatusViewModel.IsValid && TaxReferenceViewModel.IsValid;

            if (LegalStatus == LegalStatusEnum.RegisteredCompany)
            {
                CompaniesHouseRegistrationViewModel.Validate();
                IsValid = IsValid && CompaniesHouseRegistrationViewModel.IsValid;
            }
        }
 public BusinessCredentialsViewModel()
 {
     CompaniesHouseRegistrationViewModel = new CompaniesHouseRegistrationViewModel();
 }