A primary school has issued a conduct warning to parents and pupils over Zoom calls.Sacred Heart RC Primary School has ruled that parents must stay quiet when in the room with children - 'not be talking on the phone or using any inappropriate language'.It comes after a parent from the Westhoughton school was heard swearing in the background of an online lesson.Rules have now been issued to families, including the need for children to dress appropriately - in uniform or a polo shirt - after some wore crop tops.Bosses at the school say the majority of parents have been massively supportive and say the incident with a swearing parent - who was probably unaware they could be overheard - has 'been blown out of proportion'.However, defending a.