Separate accepted email template for each national center

emailtemplates.php

<?php

class EmailNotificationSubscriber
{
    public function handleAcceptedForm(AcceptedFormEvent $event)
    {
        $this->sendEmailToReferrer(EmailTemplateCode::REFERRAL_FORM_ACCEPTED, $event->getFormId());
        $this->sendAcceptedEmailToNationalCenter($event->getFormId());
    }
    
    public function sendAcceptedEmailToNationalCenter($formId)
    {
        $referralForm = $this->referralFormRepository->getById($formId);
        $templateId = EmailTemplateCode::acceptCode($referralForm->getNationalCentre());
        $this->sendAcceptedEmailToNationalCentre($templateId, $formId);
    }
}

class EmailTemplateCode
{
    const REFERRAL_FORM_ACCEPTED_LONDON = 'referral_form.accepted.london';
    const REFERRAL_FORM_ACCEPTED_SCOTLAND = 'referral_form.accepted.scotland';

    public static function acceptCode($nationalCenter) {
        return [
            1 => self::REFERRAL_FORM_ACCEPTED_LONDON,
            5 => self::REFERRAL_FORM_ACCEPTED_SCOTLAND
        ];
    }
}